Poland summoned Russia's ambassador on Wednesday over an incident involving a Russian fighter jet and a Polish border guard aircraft over the Black Sea, a spokesman for the Polish foreign ministry said, reported from foreign media sources. 

A Polish border guard aircraft on patrol for the European Union's border agency Frontex narrowly avoided a collision with a Russian fighter jet over the Black Sea near Romania on May 7, Romania and Poland said.

"We strongly condemn the provocative and aggressive behaviour of the Russian side, which is a serious international incident," Lukasz Jasina wrote on Twitter.

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