Ukraine has carried out its first strike on Russian territory with US-supplied long-range missiles just days after the Biden administration gave Kyiv the green light despite fears it could escalate the conflict beyond control. 

A fiery explosion at an ammunition depot in Karachev around 75 miles from the Ukrainian border in Russia’s Bryansk region lit up the night sky early this morning on what is the 1,000th day of war in Ukraine.

Eyewitnesses along with Russian and Ukrainian military bloggers first reported the attack, with anonymous Ukrainian military officials later telling RBC Ukraine the strike was conducted with the US-manufactured ATACMS (Army Tactical Missile System). 

Kyiv is yet to officially confirm the ATACMS strike, but Russia’s Defence Ministry claimed they shot down five missiles. A sixth missile was damaged but ultimately landed on the military facility, it said. 

The reports emerged within minutes of the Kremlin threatening a ‘nuclear response’ should Ukraine hit targets on Russian soil with Western-supplied long-range munitions.

‘The Russian Federation reserves the right to use nuclear weapons in the event of aggression against it with the use of conventional weapons,’ Kremlin press secretary Dmitry Peskov told reporters in Russia Tuesday morning.

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His statement followed Vladimir Putin‘s approval of an updated nuclear doctrine that allows his strategic forces to deploy nuclear weapons if Russian or Belarusian territory is threatened by a non-nuclear nation supported by a nuclear power.

Threats that could make Russia’s leadership consider a nuclear strike include an attack with conventional missiles, drones or other aircraft, according to the updated document. 

A Ukrainian strike on Russian territory with US-supplied missiles meets these criteria, raising fears that Moscow may now consider a dramatic escalation in the conflict.