THE risk of Russia invading Ukraine is "extremely high" the Ukrainian ambassador to the UK has said.

       The warning comes as 100,000 troops are currently massed on the border, prompting war fears.

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       The Ukrainian Ambassador has warned the risk of an invasion is extremely high Credit: AP 3

       He added that Vladimir Putin is gradually building up his forces Credit: AFP

       Vadym Prystaiko told LBC: "We believe that the risk is extremely high."

       He added that 100,000 troops are currently "not enough" but Vladimir Putin is is "gradually building up" with the helicopters and S-400 systems.

       He continued: "Either [Putin] is still playing this game, threatening us more and more, not just us the European NATO as well, gradually building up forces.

       "At the moment it is not enough to topple us, we will fight, but who knows what will come back."

       He also pledged his country will fight to the death with Russia but admitted his nation would not last long in such a military conflict.

       He said: “We will fight to the death. Unfortunately, so many people in our nation will die but we’ll try to get as many Russians, as they come.

       “We are gathering the forces but we are not that well equipped for the prolonged fight with the Russians.”

       Mr Prystaiko also hit out at Germany, saying he was disappointed with its weak response to Moscow aggression.

       He said: “The Germans are still trying to befriend Russia. If you feed the Russian bear, it will get stronger."

       It comes as earlier today Dominic Raab said the Russian President will face "very serious consequences" in case of an invasion.

       The deputy prime minister said there is a "very significant risk of an invasion".

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       "The Foreign Secretary and Foreign Office have come out making clear what the designs of the Russian government are," he told Sky's Trevor Phillips.

       "We don't go into things like sources, but it's very clear there's a concerted military build-up and a threat to the democracy and integrity of Ukraine.

       "Putin and Moscow have a habit of trying to take advantage of opportunities when the world's attention is elsewhere."

       His comments follow claims that the Russian president plans to install a "puppet government" in Kyiv.

       Britain last night took the unusual step of naming former MP Yevhen Murayev as a potential Kremlin candidate to take over in Kiev.

       The Foreign Office also identified four other Ukrainian allies who maintain links with President Putin’s intelligence chiefs.

       The revelation came as Western allies sounded fresh warnings that Russia would pay a heavy price if the 100,000 troops massed on the border stage any incursion.

       PM Boris Johnson will ramp up pressure on Russia this week as he calls for Europe and the US to step up a gear in their response.

       He will despatch Cabinet ministers across the -continent following the UK’s delivery of lethal aid to Ukraine, including 2,000 missiles and a specialist team of military trainers.

       A Downing Street source said: “The PM’s view is that the situation in Ukraine is the biggest test to the unity and resolve of the West and the Nato alliance in decades.”

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       Mr Raab said the Russian President will face serious consequences in case of an invasion Credit: PA

       Putin will face 'very serious consequences' if Russia invades Ukraine or installs puppet - but Britain WON'T send troops