ISIS reveals its strategy (Opinion)

Wounded passengers are treated following a suicide bombing at the Brussels Airport on March 22, 2016. <a href="http://www.cnn.com/2016/03/30/europe/brussels-investigation/index.html">The attacks on the airport and a subway </a>killed 32 people and wounded more than 300. ISIS claims its "fighters" launched the attacks in the Belgian capital.

Wounded passengers are treated following a suicide bombing at the Brussels Airport on March 22, 2016. The attacks on the airport and a subway killed 32 people and wounded more than 300. ISIS claims its "fighters" launched the attacks in the Belgian capital.

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Syrians gather at the site of a double car bomb attack in the Al-Zahraa neighborhood of the Homs, Syria, on February 21, 2016. <a href="http://www.cnn.com/2016/02/21/middleeast/syria-civil-war/index.html" target="_blank">Multiple attacks in Homs and southern Damascus</a> kill at least 122 and injure scores, according to the state-run SANA news agency. ISIS claimed responsibility.

Syrians gather at the site of a double car bomb attack in the Al-Zahraa neighborhood of the Homs, Syria, on February 21, 2016. Multiple attacks in Homs and southern Damascus kill at least 122 and injure scores, according to the state-run SANA news agency. ISIS claimed responsibility.

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Syrian pro-government forces gather at the site of a deadly triple bombing Sunday, January 31, in the <a href="http://www.cnn.com/2016/01/31/middleeast/syria-damascus-explosions/index.html" target="_blank">Damascus suburb of Sayeda Zeynab</a>. ISIS claimed responsibility for the attack, according to a statement circulating online from supporters of the terrorist group.

Syrian pro-government forces gather at the site of a deadly triple bombing Sunday, January 31, in the Damascus suburb of Sayeda Zeynab. ISIS claimed responsibility for the attack, according to a statement circulating online from supporters of the terrorist group.

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Yemenis check the scene of a car bomb attack Sunday, December 6, in Aden, Yemen. <a href="http://www.cnn.com/2015/12/06/middleeast/yemen-aden-governor-killed/index.html">Aden Gov. Jaafar Saad and six bodyguards died in the attack</a>, for which the terror group ISIS claimed responsibility.

Yemenis check the scene of a car bomb attack Sunday, December 6, in Aden, Yemen. Aden Gov. Jaafar Saad and six bodyguards died in the attack, for which the terror group ISIS claimed responsibility.

Wael Qubady/AP

Investigators check the scene of a mosque attack Friday, November 27, in northern Bangladesh's Bogra district. <a href="http://www.cnn.com/2015/11/27/asia/bangladesh-isis-attack-claim/index.html" target="_blank">ISIS has claimed responsibility for the attack</a> that left at least one person dead and three more wounded.

Investigators check the scene of a mosque attack Friday, November 27, in northern Bangladesh's Bogra district. ISIS has claimed responsibility for the attack that left at least one person dead and three more wounded.

AP

Wounded people are helped outside the Bataclan concert hall in Paris following a series of coordinated attacks in the city on Friday, November 13. The militant group ISIS claimed responsibility for the attacks, which killed at least 130 people and wounded hundreds more.

YOAN VALAT/EPA/LANDOV

Emergency personnel and civilians gather at the site of a <a href="http://www.cnn.com/2015/11/16/middleeast/beirut-explosions/" target="_blank">twin suicide bombing</a> in Beirut, Lebanon, on Thursday, November 12. The bombings killed at least 43 people and wounded more than 200 more. ISIS appeared to claim responsibility in a statement posted on social media.

Emergency personnel and civilians gather at the site of a twin suicide bombing in Beirut, Lebanon, on Thursday, November 12. The bombings killed at least 43 people and wounded more than 200 more. ISIS appeared to claim responsibility in a statement posted on social media.

Bilal Hussein/AP

Smoke rises over the northern Iraqi town of Sinjar on November 12. Kurdish Iraqi fighters, backed by a U.S.-led air campaign, <a href="http://www.cnn.com/2015/11/13/middleeast/iraq-free-sinjar-isis/" target="_blank">retook the strategic town, </a>which ISIS militants overran last year. ISIS wants to create an Islamic state across Sunni areas of Iraq and Syria.

Smoke rises over the northern Iraqi town of Sinjar on November 12. Kurdish Iraqi fighters, backed by a U.S.-led air campaign, retook the strategic town, which ISIS militants overran last year. ISIS wants to create an Islamic state across Sunni areas of Iraq and Syria.

Bram Janssen/AP

Syrian government troops walk inside the Kweiras air base on Wednesday, November 11, after they broke a siege imposed by ISIS militants.

SANA/AP

Members of the Egyptian military approach the wreckage of a Russian passenger plane Sunday, November 1, in Hassana, Egypt. <a href="http://www.cnn.com/2015/10/31/world/gallery/russian-plane-crash/index.html" target="_blank">The plane crashed</a> the day before, killing all 224 people on board. ISIS claimed responsibility for downing the plane, but the group's claim wasn't immediately verified.

Members of the Egyptian military approach the wreckage of a Russian passenger plane Sunday, November 1, in Hassana, Egypt. The plane crashed the day before, killing all 224 people on board. ISIS claimed responsibility for downing the plane, but the group's claim wasn't immediately verified.

Maxim Grigoriev/Russian Ministry for Emergency Situations/AP

An explosion rocks Kobani, Syria, during a reported car bomb attack by ISIS militants on Tuesday, October 20.

Gokhan Sahin/Getty Images

Shiite fighters, fighting alongside Iraqi government forces, fire a rocket at ISIS militants as they advance toward the center of Baiji, Iraq, on Monday, October 19.

AHMAD AL-RUBAYE/AFP/Getty Images

Smoke rises above a damaged building in Ramadi, Iraq, following a coalition airstrike against ISIS positions on Saturday, August 15.

AP