Ukraine has begun calling up reservists and deploying troops to the border to counter what it says is a growing threat of Russian invasion.

President Petro Poroshenko, who last week declared martial law in 10 regions, announced the military actions on Monday in response to what he said was a, “sharp increase in Russian forces forces along our borders and in occupied Crimea.”

Vladimir Putin’s spokesman yesterday called this statement “absolutely absurd” and accused Ukraine’s leader of “provoking tensions” before the Russian presidential election in March.