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US Secretary of State Mike Pompeo (3rd L) shakes hands with North Korea's Foreign Minister Ri Yong Ho (3rd R) as they arrive for a group photo at the ASEAN Regional Forum Retreat during the 51st Association of Southeast Asian Nations (ASEAN) Ministerial Meeting (AMM) in Singapore on August 4, 2018. - Leaders, ministers and representatives are meeting in the city-state from August 1 to 4 for the ASEAN Ministerial Meeting (AMM). (Photo by Mohd RASFAN / AFP)        (Photo credit should read MOHD RASFAN/AFP/Getty Images)
PHOTO: MOHD RASFAN/AFP/AFP/Getty Images
US Secretary of State Mike Pompeo (3rd L) shakes hands with North Korea's Foreign Minister Ri Yong Ho (3rd R) as they arrive for a group photo at the ASEAN Regional Forum Retreat during the 51st Association of Southeast Asian Nations (ASEAN) Ministerial Meeting (AMM) in Singapore on August 4, 2018. - Leaders, ministers and representatives are meeting in the city-state from August 1 to 4 for the ASEAN Ministerial Meeting (AMM). (Photo by Mohd RASFAN / AFP) (Photo credit should read MOHD RASFAN/AFP/Getty Images)
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PHOTO: SAUL LOEB/AFP/AFP/Getty Images
TOPSHOT - US President Donald Trump (R) poses with North Korea's leader Kim Jong Un (L) at the start of their historic US-North Korea summit, at the Capella Hotel on Sentosa island in Singapore on June 12, 2018. - Donald Trump and Kim Jong Un have become on June 12 the first sitting US and North Korean leaders to meet, shake hands and negotiate to end a decades-old nuclear stand-off. (Photo by SAUL LOEB / AFP) (Photo credit should read SAUL LOEB/AFP/Getty Images)
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TOPSHOT - North Korea's leader Kim Jong Un (L) shakes hands with US President Donald Trump (R) after taking part in a signing ceremony at the end of their historic US-North Korea summit, at the Capella Hotel on Sentosa island in Singapore on June 12, 2018. - Donald Trump and Kim Jong Un became on June 12 the first sitting US and North Korean leaders to meet, shake hands and negotiate to end a decades-old nuclear stand-off. (Photo by Anthony WALLACE / POOL / AFP)        (Photo credit should read ANTHONY WALLACE/AFP/Getty Images)
PHOTO: ANTHONY WALLACE/AFP/AFP/Getty Images
TOPSHOT - North Korea's leader Kim Jong Un (L) shakes hands with US President Donald Trump (R) after taking part in a signing ceremony at the end of their historic US-North Korea summit, at the Capella Hotel on Sentosa island in Singapore on June 12, 2018. - Donald Trump and Kim Jong Un became on June 12 the first sitting US and North Korean leaders to meet, shake hands and negotiate to end a decades-old nuclear stand-off. (Photo by Anthony WALLACE / POOL / AFP) (Photo credit should read ANTHONY WALLACE/AFP/Getty Images)
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SINGAPORE, SINGAPORE - JUNE 12:  In this handout photograph provided by The Strait Times, North Korean leader Kim Jong-un (L) with U.S. President Donald Trump (R) during their historic U.S.-DPRK summit at the Capella Hotel on Sentosa island on June 12, 2018 in Singapore. U.S. President Trump and North Korean leader Kim Jong-un held the historic meeting between leaders of both countries on Tuesday morning in Singapore, carrying hopes to end decades of hostility and the threat of North Korea's nuclear programme. (Photo by Kevin Lim/The Strait Times/Handout/Getty Images)
PHOTO: Kevin Lim/The Strait Times/Handout/Getty Images
SINGAPORE, SINGAPORE - JUNE 12: In this handout photograph provided by The Strait Times, North Korean leader Kim Jong-un (L) with U.S. President Donald Trump (R) during their historic U.S.-DPRK summit at the Capella Hotel on Sentosa island on June 12, 2018 in Singapore. U.S. President Trump and North Korean leader Kim Jong-un held the historic meeting between leaders of both countries on Tuesday morning in Singapore, carrying hopes to end decades of hostility and the threat of North Korea's nuclear programme. (Photo by Kevin Lim/The Strait Times/Handout/Getty Images)
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PHOTO: Handout/Getty Images AsiaPac/Getty Images
SINGAPORE - JUNE 12: In this handout photo, North Korean leader Kim Jong-un shakes hands with U.S. President Donald Trump during their historic U.S.-DPRK summit at the Capella Hotel on Sentosa island on June 12, 2018 in Singapore. U.S. President Trump and North Korean leader Kim Jong-un held the historic meeting between leaders of both countries on Tuesday morning in Singapore, carrying hopes to end decades of hostility and the threat of North Korea's nuclear program. (Photo by Kevin Lim/THE STRAITS TIMES/Handout/Getty Images)
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U.S. Secretary of State Mike Pompeo, left, speaks during a meeting with North Korean Director of the United Front Department Kim Yong Chol at the Park Hwa Guest House in Pyongyang, North Korea, Friday, July 6, 2018. Pompeo is on a trip traveling to North Korea, Japan, Vietnam, Abu Dhabi, and Brussels. (AP Photo/Andrew Harnik, Pool)
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U.S. Secretary of State Mike Pompeo, left, speaks during a meeting with North Korean Director of the United Front Department Kim Yong Chol at the Park Hwa Guest House in Pyongyang, North Korea, Friday, July 6, 2018. Pompeo is on a trip traveling to North Korea, Japan, Vietnam, Abu Dhabi, and Brussels. (AP Photo/Andrew Harnik, Pool)
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U.S. Secretary of State Mike Pompeo, second from right, greets Kim Yong Chol, second from left, a North Korean senior ruling party official and former intelligence chief, as they arrive for a meeting at the Park Hwa Guest House in Pyongyang, North Korea, Friday, July 6, 2018. Pompeo is on a trip traveling to North Korea, Japan, Vietnam, Abu Dhabi, and Brussels. Also pictured is Andrew Kim, the head of the CIA's Korea Mission Center, right. (AP Photo/Andrew Harnik, Pool)
PHOTO: Andrew Harnik/AP
U.S. Secretary of State Mike Pompeo, second from right, greets Kim Yong Chol, second from left, a North Korean senior ruling party official and former intelligence chief, as they arrive for a meeting at the Park Hwa Guest House in Pyongyang, North Korea, Friday, July 6, 2018. Pompeo is on a trip traveling to North Korea, Japan, Vietnam, Abu Dhabi, and Brussels. Also pictured is Andrew Kim, the head of the CIA's Korea Mission Center, right. (AP Photo/Andrew Harnik, Pool)
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Editor’s Note: Frida Ghitis, a former CNN producer and correspondent, is a world affairs columnist. She is a frequent opinion contributor to CNN and The Washington Post and a columnist for World Politics Review. The opinions expressed in this commentary are those of the author; view more opinion articles on CNN.

(CNN) —  

The day after he gave himself an A+ on his presidential performance, President Donald Trump unexpectedly canceled a crucial trip to North Korea by Secretary of State Mike Pompeo, all but acknowledging that his strategy to end the North Korean nuclear threat has so far failed.

Trump, you’ll recall, had already declared that North Korea was “no longer a nuclear threat” after he met with the country’s leader, Kim Jong Un in Singapore last June.

He had humble-bragged that “everybody thinks” he should win a Nobel Peace Prize over his dazzling diplomatic achievement. And, in words reminiscent of the infamous “peace for our time,” speech by Neville Chamberlain (“Now I recommend you to go home and sleep quietly in your beds”), Trump told us “Sleep well tonight” after his lovefest with Kim.

But the troubles that came after the Singapore summit were not just predictable, they were widely predicted.

02:52 - Source: CNN
Trump: Kim Jong Un has been open, terrific
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PHOTO: Pleiades © CNES 2018, Distribution Airbus DS
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US Secretary of State Mike Pompeo (3rd L) shakes hands with North Korea's Foreign Minister Ri Yong Ho (3rd R) as they arrive for a group photo at the ASEAN Regional Forum Retreat during the 51st Association of Southeast Asian Nations (ASEAN) Ministerial Meeting (AMM) in Singapore on August 4, 2018. - Leaders, ministers and representatives are meeting in the city-state from August 1 to 4 for the ASEAN Ministerial Meeting (AMM). (Photo by Mohd RASFAN / AFP)        (Photo credit should read MOHD RASFAN/AFP/Getty Images)
PHOTO: MOHD RASFAN/AFP/AFP/Getty Images
US Secretary of State Mike Pompeo (3rd L) shakes hands with North Korea's Foreign Minister Ri Yong Ho (3rd R) as they arrive for a group photo at the ASEAN Regional Forum Retreat during the 51st Association of Southeast Asian Nations (ASEAN) Ministerial Meeting (AMM) in Singapore on August 4, 2018. - Leaders, ministers and representatives are meeting in the city-state from August 1 to 4 for the ASEAN Ministerial Meeting (AMM). (Photo by Mohd RASFAN / AFP) (Photo credit should read MOHD RASFAN/AFP/Getty Images)
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PHOTO: SAUL LOEB/AFP/AFP/Getty Images
TOPSHOT - US President Donald Trump (R) poses with North Korea's leader Kim Jong Un (L) at the start of their historic US-North Korea summit, at the Capella Hotel on Sentosa island in Singapore on June 12, 2018. - Donald Trump and Kim Jong Un have become on June 12 the first sitting US and North Korean leaders to meet, shake hands and negotiate to end a decades-old nuclear stand-off. (Photo by SAUL LOEB / AFP) (Photo credit should read SAUL LOEB/AFP/Getty Images)
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PHOTO: ANTHONY WALLACE/AFP/AFP/Getty Images
TOPSHOT - North Korea's leader Kim Jong Un (L) shakes hands with US President Donald Trump (R) after taking part in a signing ceremony at the end of their historic US-North Korea summit, at the Capella Hotel on Sentosa island in Singapore on June 12, 2018. - Donald Trump and Kim Jong Un became on June 12 the first sitting US and North Korean leaders to meet, shake hands and negotiate to end a decades-old nuclear stand-off. (Photo by Anthony WALLACE / POOL / AFP) (Photo credit should read ANTHONY WALLACE/AFP/Getty Images)
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PHOTO: Kevin Lim/The Strait Times/Handout/Getty Images
SINGAPORE, SINGAPORE - JUNE 12: In this handout photograph provided by The Strait Times, North Korean leader Kim Jong-un (L) with U.S. President Donald Trump (R) during their historic U.S.-DPRK summit at the Capella Hotel on Sentosa island on June 12, 2018 in Singapore. U.S. President Trump and North Korean leader Kim Jong-un held the historic meeting between leaders of both countries on Tuesday morning in Singapore, carrying hopes to end decades of hostility and the threat of North Korea's nuclear programme. (Photo by Kevin Lim/The Strait Times/Handout/Getty Images)
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SINGAPORE - JUNE 12: In this handout photo, North Korean leader Kim Jong-un shakes hands with U.S. President Donald Trump during their historic U.S.-DPRK summit at the Capella Hotel on Sentosa island on June 12, 2018 in Singapore. U.S. President Trump and North Korean leader Kim Jong-un held the historic meeting between leaders of both countries on Tuesday morning in Singapore, carrying hopes to end decades of hostility and the threat of North Korea's nuclear program. (Photo by Kevin Lim/THE STRAITS TIMES/Handout/Getty Images)
PHOTO: Handout/Getty Images AsiaPac/Getty Images
SINGAPORE - JUNE 12: In this handout photo, North Korean leader Kim Jong-un shakes hands with U.S. President Donald Trump during their historic U.S.-DPRK summit at the Capella Hotel on Sentosa island on June 12, 2018 in Singapore. U.S. President Trump and North Korean leader Kim Jong-un held the historic meeting between leaders of both countries on Tuesday morning in Singapore, carrying hopes to end decades of hostility and the threat of North Korea's nuclear program. (Photo by Kevin Lim/THE STRAITS TIMES/Handout/Getty Images)
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PHOTO: Andrew Harnik/AP
U.S. Secretary of State Mike Pompeo, left, speaks during a meeting with North Korean Director of the United Front Department Kim Yong Chol at the Park Hwa Guest House in Pyongyang, North Korea, Friday, July 6, 2018. Pompeo is on a trip traveling to North Korea, Japan, Vietnam, Abu Dhabi, and Brussels. (AP Photo/Andrew Harnik, Pool)
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PHOTO: Mark Wilson/Getty Images
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U.S. Secretary of State Mike Pompeo, second from right, greets Kim Yong Chol, second from left, a North Korean senior ruling party official and former intelligence chief, as they arrive for a meeting at the Park Hwa Guest House in Pyongyang, North Korea, Friday, July 6, 2018. Pompeo is on a trip traveling to North Korea, Japan, Vietnam, Abu Dhabi, and Brussels. Also pictured is Andrew Kim, the head of the CIA's Korea Mission Center, right. (AP Photo/Andrew Harnik, Pool)
PHOTO: Andrew Harnik/AP
U.S. Secretary of State Mike Pompeo, second from right, greets Kim Yong Chol, second from left, a North Korean senior ruling party official and former intelligence chief, as they arrive for a meeting at the Park Hwa Guest House in Pyongyang, North Korea, Friday, July 6, 2018. Pompeo is on a trip traveling to North Korea, Japan, Vietnam, Abu Dhabi, and Brussels. Also pictured is Andrew Kim, the head of the CIA's Korea Mission Center, right. (AP Photo/Andrew Harnik, Pool)
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