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The US-made weapon was fired across the border by Ukraine for the first time on Tuesday, the 1,000th day of the war.
Russia reacted with fury to the news, saying it marked a “new phase of the Western war” against Moscow and that it would react “accordingly”.
Mr Biden’s move prompted speculation the UK would also allow Ukraine to fire British-made Storm Shadow missiles on target into Russia.
While Sir Keir Starmer avoided confirming whether London would follow in Washington’s footsteps, he said at the G20 summit on Monday that the UK recognised it needed to “double down” on its support for Ukraine.
On Wednesday, reports emerged claiming Ukraine launched several Storm Shadow missiles at targets in the Russian region of Kursk, partially occupied by Kyiv forces.
Unconfirmed reports suggest the missiles were used to destroy a Russian command post in the area.
This came following claims Washington gave the green light for Ukraine to launch British Storm Shadow missiles into Russian territory, with Ukrainian media citing The Times reporting a Foreign Office source alleging the turning point was the arrival of North Korean troops in Russia.
In light of the use of Western-made long-range missiles into Russia and the new nuclear doctrine approved by the Kremlin, Express.co.uk is now asking its readers whether they fear Putin could launch a nuclear attack on the UK?