Ukrainian President Volodymyr Zelenskyy urged the EU on Tuesday (Mar 1) via video link to an emergency session of the European Parliament to "prove that you are with us" in Ukraine's war with Russia, a day after Kyiv officially asked to join the bloc.

European Union lawmakers, many wearing #standwithUkraine T-shirts bearing the Ukrainian flag, others with blue-and-yellow scarves or ribbons, gave Zelenskyy a standing ovation.

"We are fighting to be equal members of Europe," Zelenskyy said in Ukrainian in a speech translated into English by an interpreter who spoke through tears.

"Do prove that you are with us. Do prove that you will not let us go. Do prove that you are indeed Europeans, and then life will win over death and light will win over darkness," he said. "The EU will be much stronger with us."

Zelenskyy has remained in Kyiv to rally his people against the invasion. As he spoke on Tuesday, a Russian armoured column was bearing down on Ukraine's capital.

The presidents of eight central and eastern European nations on Monday published an open letter calling for Ukraine to be granted immediate EU candidate status and for the start of formal membership talks.