With Nato assessments that there are some 40,000 Russian troops massed on the Ukrainian border ready to move at a few hours' notice, the heightening war of words between Moscow and Kiev raises a genuine prospect of conflict. If Russia requires a pretext to move into eastern Ukraine, then many of the elements of that narrative are already in place. But what of the Russian military's capabilities? What can be deduced from what we have seen so far of Russian operations in Crimea? *. This 14 March 2014 photo of the Primorsko-Akhtarsk airbase in south-western Russia shows a build-up in the number of tactical aircraft *. There are primarily Sukhoi Su-25 Frogfoot strike aircraft (lower left) and Sukhoi Su-27 (on the right) *. While possibly deployed to initially be available over Crimea, they are also within range of a lot of eastern Ukraine and represent a threat to any Ukrainian armoured units Keir Giles, director of the Conflict Studies Research Centre (CSRC), a group specialisin...