Romania scrambled fighter jets when a drone breached the country's airspace during a Russian attack on Ukrainian infrastructure near the border, the defence ministry said.

Polish and allied aircraft were also deployed in a preventive operation in Poland's airspace because of a threat of drone strikes in neighbouring Ukraine, and the airport in the eastern Polish city of Lublin was temporarily closed.

Ukrainian President Volodymyr Zelenskiy said on social media platform X that data showed the drone breached about 10km into Romanian territory and operated in NATO airspace for around 50 minutes.

"It is an obvious expansion of the war by Russia – and this is exactly how they act," he said.

Romania, a European Union and NATO state which shares a 650-km (400-mile) border with Ukraine, has ha

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