Belarus is still forcing migrants to illegally cross the border with Poland as the Minsk government tries to destabilise its neighbour, the Polish defence minister has said.
Polish President Andrzej Duda has said that the international community, by acting together, can stop the Russian invasion and hold Russia accountable for the war crimes it has committed.
The presidents of the Bucharest Nine group of Nato's eastern flank countries have condemned Russia's missile strikes against Ukrainian cities on Monday that left at least 19 people dead.
Andrzej Duda, the Polish president, has said that the most important task today is to support Ukraine and work out a coherent strategy to stop Russian President Vladimir Putin.
Andrzej Duda, the Polish president, has expressed hope that the forthcoming Nato summit in Madrid will approve a new form of the presence of allied troops on the alliance's eastern flank.
Poland's president believes that halting Russian aggression is possible through common European actions and support for Ukraine.
Poland's president said at the start of a meeting on Friday of the Budapest Nine countries of Nato's eastern flank that "passive condemnation" of Russia's attack on Ukraine was insufficient and that Ukraine needs support, including the provision of arms.
Warsaw will host a summit of the 'Bucharest Nine' format presidents, who will meet on Friday to discuss Ukraine and the security situation in Central and Eastern Europe, according to a presidential official.
Nato must continue to be a counterweight to Russia's offensive potential, the head of Poland's National Security Bureau said on Thursday.
The presidents of the Bucharest Nine, a group of countries forming Nato's eastern flank, point out "permanent threat" from Russia, Polish President Andrzej Duda said after the group's summit in Bucharest on Monday.