STORY: Zelenskiy's recorded address to world leaders at the U.N. General Assembly on Wednesday came after Russian President Vladimir Putin ordered Russia's first wartime mobilization since World War Two.

Moscow plans to conscript some 300,000 troops in an apparent escalation of its Ukraine invasion that began in February and has left thousands dead, displaced millions and reduced towns to rubble.

Zelenskiy laid out what he said were five non-negotiable conditions for peace.

These included punishment for Russian aggression, restoration of Ukraine's security and territorial integrity, and security guarantees.

Many delegates at the U.N. gave Zelenskiy a standing ovation at the end of his speech.

The Russian delegation remained seated.