Ukraine has accused Russia of planning a wide-ranging ground offensive for early in the new year, despite recent Russian military setbacks.
President Volodymyr Zelensky and senior officials have warned that Kyiv and its allies must guard against complacency.
The offensive could come in the eastern Donbas region, in the south, or even towards Kyiv, senior generals say.
Western analysts say Russia’s ability to conduct successful offensive ground operations is rapidly diminishing.
Britain’s most senior military officer Admiral Sir Tony Radakin said this week that the war would only get worse for Moscow, which he added was now facing a critical shortage of artillery munitions.
