Prime minister has not yet set out whether he will give go-ahead for long-range missiles from Britain’s own arsenal to be used by Ukraine to strike Russia.

U.S. President Joe Biden recently green-lighted Ukraine’s use of ATACMS.

KYIV: Ukraine said on Tuesday (Nov 19) it had fired US-supplied long-range missiles into Russian territory in the first such strike, as Russia declared a "new phase" in the conflict and eased its protocol for nuclear strikes. A senior official told AFP that a strike on Russia's Bryansk region earlier

The US decision to authorise long-range Ukrainian strikes could help Kyiv defend the foothold in Russia's Kursk region but may come too late to change the course of the war, analysts say.

The decision to let Kyiv use the Army Tactical Missile System for attacks deeper inside Russia comes as Putin deploys North Korean reinforcements and recently launched a massive drone and missile attack targeting Ukraine’s energy infrastructure.