Russia has been ramping up its forces near the border with Ukraine since August and now poses the greatest military threat since 2014, the year Moscow annexed Crimea, the commander of Ukraine's armed forces told Reuters in an interview on Tuesday. General Viktor Muzhenko gestured to a series of satellite images which he said showed the presence of Russian T-62 M tanks stationed 18 kilometers from the Ukrainian border. They had more than doubled to 250 from 93 machines within the space of two weeks from mid-September to Oct 1. For Muzhenko this is evidence of a concerted build-up of Russian forces in the run-up to Nov. 25, when Russia fired on and captured three Ukrainian vessels at the Kerch Strait, an action Kiev's leadership fears may be a precursor to a full-scale invasion. Ukraine and Russia have traded accusations over the clash. The Kremlin's spokesman on Monday dismissed as "absurd" the notion that Russia wanted to forcibly take over Ukrainian ports.

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Muzhenko said Russian troop levels were at "the highest" since 2014, when Moscow annexed Crimea and then deployed forces to eastern Ukraine. "In front of us is an aggressor who has no legal, moral or any other limits," he said. "It is very difficult to predict when it will occur to him to begin active combat actions against Ukraine." "This [the Kerch Strait incident] was an act of aggression from regular forces, the border service [of the Russian Federation] in relation to the Ukrainian armed forces," Muzhenko said. The Russian defense ministry did not immediately respond to a request for comment. Muzhenko said Ukraine had deployed more land and air forces to the region in response, and intensified military exercises across the country, but declined to go into specifics.

He added that Ukraine expects to complete the building of a military base on the Azov Sea, which had been planned before the navy clash, by next year. Ukraine was also expecting help from allies, mostly the United States, for equipment including air and naval reconnaissance, boats and weapons for ground troops, he said. Collapse of relations Relations between Ukraine and Russia collapsed following the 2014 Crimea annexation and Russia's support for separatist rebels in the eastern Donbass region. The Donbass conflict has killed more than 10,000 people despite a notional ceasefire. Russia strongly denies sending troops and heavy weapons to the area. Ukrainian President Petro Poroshenko introduced martial law last week for a period of 30 days in regions of the country thought most vulnerable to a Russian attack.