Aircraft from Poland and another unnamed NATO member responded to the latest wave of Russian strikes on Ukraine.

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.