More US support to Kyiv

While Biden was in Kyiv, the US State Department announced more support for Ukraine, comprising $450 million of artillery ammunition, anti-armor systems and air defense radars, and $10 million for energy infrastructure.

However, Biden has not acceded to Ukraine's request for fighter jets.

In a speech on Tuesday he was due to rally support for Ukraine as the conflict enters its second year on Friday.

Poland has NATO's longest border with Ukraine and has been the main route in for weapons and out for refugees. Earlier, Duda's foreign policy adviser said the two leaders would discuss Poland's security and scaling up NATO resources there.

Marian Switala, 70, of Warsaw, said he hoped "that this conflict will somehow be resolved and there will be peace in Ukraine and the surrounding area".

Before returning to Washington on Wednesday Biden was due to meet leaders of the Bucharest Nine, the countries on NATO's eastern flank, to reaffirm support for their security.

                                                                                     Agencies via Xinhua