"There are no immediate indications that the Russians would run out of steam in the near future," military analyst Emil Kastehelmi told Newsweek.

Ukrainian President Volodymyr Zelensky says he wants to work “directly” with US President-elect Donald Trump and is open to his ideas, highlighting Kyiv’s eagerness to keep its most important ally onside as Russia intensifies its attacks.

In further remarks to Sky News, the UK’s former representative to Nato, Sir Adam Thomson, said Mr Zelensky appeared to be preparing domestic audiences for compromises, while “making opening moves” in a likely extended negotiation with Mr Trump over which line to take with the Kremlin.