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Standoff at Ukraine base in Crimea
02:22 - Source: CNN

Story highlights

NEW: The United States suspends bilateral trade talks with Russia

Ukraine envoy: Russian has sent 16,000 troops into Crimea

Russia says Yanukovych asked them to send troops

Former Ukraine PM asks "all the world" for help in stopping Ukraine from losing Crimea

CNN  — 

Russia showed no signs of backing down Monday even as world leaders threatened sanctions and sternly rebuked the country for sending troops into Ukraine.

At an emergency U.N. Security Council meeting to discuss the unfolding crisis, Ukraine’s envoy asked for help, saying that Russia had used planes, boats and helicopters to flood the Ukrainian peninsula of Crimea with 16,000 troops in the past week.

“So far, Ukrainian armed forces have exercised restraint and refrained from active resistance to the aggression, but they are in full operational readiness,” Ukrainian Ambassador Yuriy Sergeyev said.

As diplomats at the meeting asked Russia to withdraw its troops and called for mediation to end the crisis, Russian Ambassador Vitaly Churkin insisted his country’s aims were preserving democracy, protecting millions of Russians in Ukraine and stopping radical extremists.

He said ousted President Viktor Yanukovych remains Ukraine’s elected leader and has asked Russia to send troops.