In a significant escalation of the Ukraine conflict, the Biden administration has authorized Ukraine to use US-supplied long-range missiles, including ATACMS, for strikes deep into Russian territory. This decision has drawn sharp criticism from Moscow, which accuses the US of ‘fuelling the fire’ of the conflict and warns that it may lead to a new level of involvement for Washington. Retired military officials have expressed concerns that this move could provoke a strong response from President Putin, with implications for global peace, potentially risking World War III. As Ukrainian forces prepare for deeper strikes, the ramifications of this military support are being closely monitored, both in Kyiv and Moscow.