Poland's armed forces have scrambled aircraft in response to the threat posed by a combined drone and missile attack by Russian forces on Ukraine. The NATO member said in a statement the aircraft were deployed overnight Sunday and air defense and radar reconnaissance systems had been placed on high alert.

The man is suspected of setting fire to construction warehouses in Warsaw on May 23 and in Radom, a city some 80 kilometers (50 miles) south of the capital, on May 30, Poland's Internal Security Agency (ABW) said.

Ukraine faced another Russian drone and missile attack early Monday, with air raid alerts sounding across the country for at least six hours since midnight Kyiv time.