Finland, which shares a 1,300-km (810-mile) border with Russia, and Sweden are considering joining the NATO alliance. Finland will decide in the next few weeks, Prime Minister Sanna Marin said on Wednesday.
More than 30 Russian cruise missiles targeted the sprawling facility, which lies not far from the border with NATO member Poland and that has long been used to train Ukrainian military personnel.
Russia and Ukraine traded blame over the failure to provide safe passage to civilians fleeing the two bombarded cities.
Dmytro Kuleba delivered a powerful message at an extraordinary meeting of NATO Foreign Ministers.
"There are decisions only on the organization of humanitarian corridors," said a Ukrainian official after the three-hour meeting with representatives of Russia.
The former World Chess Champion has urged world leaders to stop Vladimir Putin before he goes again after 'exterminating Ukraine'.
Zelenskiy urged NATO members to impose a no fly zone to stop the Russian air force, saying this would be a preventative measure and not meant to drag the alliance into war with Russia.
Russia faced deepening isolation and economic turmoil as Western nations, united in condemnation of its assault, hit it with an array of sanctions.
Sunday's directive to put Russia's nuclear weapons in an increased state of readiness for launch raised fears that the crisis could boil over into nuclear warfare, whether by design or mistake.
British Prime Minister Boris Johnson urged NATO leaders to take immediate action.