Ukraine wants permission from the west to use long-range Storm Shadow missiles to destroy targets deep inside Russia, believing this could force Moscow into negotiating an end to the fighting.

Senior figures in Kyiv have suggested that using the Anglo-French weapons in a “demonstration attack” will show the Kremlin that military sites near the capital itself could be vulnerable to direct strikes.

The thinking, according to a senior government official, is that Russia will consider negotiating only if it believes Ukraine had the ability “to threaten Moscow and St Petersburg”. This is a high-risk strategy, however, and does not so far have the support of the US.

Ukraine has been lobbying for months to be allowed to use Storm Shadow against targets inside Russia, but with little success. Nevertheless, as its army struggles on the eastern front, there is a growing belief that its best hope lies in counter-attack.