The first shots of war between Russia and Ukraine have already been fired - ever since the 2014 Crimea invasion.
Moscow’s forces already occupy parts of Ukraine, in Crimea and Donbas, where there are regular exchanges of fire, along a 250 mile frontline of trenches.
As many as 14,000 have died there in years of fighting, which has settled into trench warfare and could break out at any moment into a much bigger conflict.
