Ukrainian President Volodymyr Zelensky arrived in Poland on Wednesday to strengthen ties with a neighbouring country that has played a big role in galvanising Western military and political support for Kyiv against Russia's full-scale invasion.

Ukrainian President Volodymyr Zelensky  has crossed the border into Poland ahead of his official visit to the capital Warsaw, the Polish president's foreign policy adviser said on Wednesday. "I can say that President Zelensky has crossed the Polish border," Marcin Przydacz told private broadcaster TVN24.

Zelensky's visit to neighbouring Poland, a close ally that has played a big role in galvanising Western military and political support for Kyiv against Russia's invasion, comes as Ukraine plans a counteroffensive to recapture occupied land in its east and south.

Poland has taken in more than 1 million Ukrainian refugees over the past 13 months of war. The NATO member has also played an important role in persuading other Western powers to supply tanks and other weaponry to Ukraine.