U.S. Missile Supplies Spark Russian Concern
Tomahawk missiles have a 2,500 km range.
Putin says using missiles without U.S. involvement triggers new escalation stage.
Some missiles carry nuclear warheads, a factor Kremlin officials note.
U.S. has aided Ukraine in planning long-range strikes for months.
Trump says he wants to know Ukraine's plans before agreeing to provide missiles.
Kremlin views the war as a watershed tied to NATO expansion, Europe's deadliest since WWII.
3 months ago