Russia is threatening to strike British military facilities and says it plans to hold drills simulating the use of battlefield nuclear weapons. Monday's statements came after the Kremlin reacted angrily to comments by senior Western officials about the war in Ukraine. Moscow warned that Ukrainian strikes on Russian territory using U.K.-supplied weapons could bring retaliatory strikes against British military facilities and equipment on the Ukrainian territory or elsewhere. It was the first time Russia has publicly announced drills involving tactical nuclear weapons, though its strategic nuclear forces regularly hold exercises. Tactical nuclear weapons have a lower yield compared to massive warheads that arm intercontinental ballistic missiles intended to obliterate entire cities. Read moreRussia warns Britain and plans nuclear drills over the West's possible deepening role in Ukraine