Volodymyr Zelenskyy has called on the west to overcome its “fear” and let Ukraine fire British long-range missiles into Russia. The Ukrainian president urged its allies to show “decisiveness” after Moscow launched fresh attacks on the city of Kharkiv.

They warned Starmer that "any further delay will embolden President Putin", the Sunday Times said. Ukrainian President Volodymyr Zelenskiy has been pleading with allies for months to let Ukraine fire Western missiles including long-range U.

Russian officials threatened the West on Saturday with an uncontrolled escalation of war and Ukraine with the destruction of Kyiv as Western leaders discussed whether to allow Ukraine to use their weapons for strikes deep into Russian territory.

Russia's FSB security service said on Friday it had revoked the accreditation of six British diplomats in Moscow after accusing them of spying and sabotage work, signalling the Kremlin's anger at what it sees as London's vital role in helping Ukraine.

The United States and its allies are once again considering expanding the capabilities they provide to Ukraine in its fight against Russia’s invasion.

The discussion comes as Russian President Vladimir Putin warns that such a decision would put NATO countries “at war” with Moscow.