Labour is preparing for a direct military attack from Russia following concerns Britain is not ready for war.
A request has been made to update a set of contingency plans that would put the UK on a war footing after threats of attack by the Kremlin.
The Telegraph reports ministers are concerned British armed forces would not be able to cope against Russia and its allies, both on the battlefield and at home.
A classified “homeland defence plan”, which has not been updated since 2005, will lay down a strategy for the immediate response to any attack on Britain.
Some of the moves reportedly include bunkers to protect the Cabinet and the Royal family, public service broadcasts and the stockpiling of resources.
It comes as British troops are understood to be set to move on the ground to defend Ukraine, with Kremlin officials repeatedly making threats to the UK with a direct attack over its support for Ukraine.
Sergei Shoigu, the ex-defence minister, said that Russia will not tolerate foreign boots on the ground in Ukraine.
A Government spokesman told The Telegraph: “The UK has robust plans in place for a range of potential emergencies that have been developed and tested over many years.”
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It comes after defence officials also called for Britain to develop its own version of Israel’s Iron Dome to protect it from missile attacks.
General HR McMaster also urged the Government and the US to spend four per cent of GDP on the military because “it’s a heck of a lot cheaper to prevent a war than have a fight.”
He told LBC: “I think that every country is going to have to develop these kinds of defences and long-range missiles.”
Chief of the Defence Staff Admiral Sir Tony Radakin said last month that the UK was in “live conversations” to develop an Iron Dome.
Yesterday, Sir Keir Starmer and French President Emmanuel Macron discussed the war in Ukraine and migration in a call.
A Downing Street spokeswoman said: “The Prime Minister began by reflecting on how privileged he felt to be part of the moving VE Day celebrations this week, including the commemorative events held today.
“Turning to the situation in Ukraine, the leaders discussed the need for Russia to commit to a 30-day ceasefire to ensure meaningful peace talks.”
“Ukraine had proved it was willing and ready to come to the table and was the party of peace,” the Prime Minister spokeswoman added.
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