Firstly, there is a limited supply of ATACMS that Ukraine can get its hands on. So even Kyiv being able to hit deep inside Russia – and the longer range of ATACMS is 100km or 62 miles – is not going to yield an overnight change in the battlefield.

Joe Biden has authorised Ukraine’s use of long-range missiles to strike hundreds of miles inside Russia for the first time, according to reports.The decision marks a major policy shift and comes after Russia warned that Moscow would see the move to allow the use of US-made missiles as an “escalation.