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Polish Ambassador to Ukraine Jan Pieklo believes unity between Poland and Ukraine is key to deterring aggressive Russia.

"The most important factor in counteracting Russian aggression and hybrid war is Western values," Jan Pieklo said, speaking at the Kyiv Security Forum on Thursday, according to Open Ukraine Fund.

"We need unity. Poland is a real and true ally of Ukraine," the Ambassador said.

"Without a democratic Ukraine, there will be no security in the whole of Europe," said the Polish diplomat.

Read alsoPoland's Lech Kaczynski was "last great" regional leader: Ukraine's YushchenkoEarlier, Polish and Ukrainian government heads confirmed the strategic nature of partnership between the two countries.

"Poland supports and will continue to support Euro-Atlantic aspirations of Ukraine," Polish Prime Minister Mateusz Morawiecki said in a telephone conversation with his Ukrainian counterpart Volodymyr Groysman, the Polish Prime Minister's Chancellery reported.