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(CNN) - A former NATO Supreme Allied Commander does not have any doubt that Russian President Vladimir Putin is responsible for the shoot down of Malaysia Airlines Flight 17.
"[Putin] is the man who is responsible. This is all about Vladimir Putin's - it's his vision of restoring Russia to its greatness. He's lusted after Ukraine from the time he became prime minister that we know of," retired General Wesley Clark tells CNN's Jake Tapper. "Yes, he's responsible, no doubt about it in my view."
The senior fellow at the UCLA Burkle Center also believes some NATO countries have reason to be concerned over Russia's "war of subversion" against Ukraine.
"There's a lot of concern in NATO countries, especially eastern European NATO countries, that the tactics and strategies that Russia is following lead right to them," says Clark. "It's basically a war of subversion and it's perpetrated not only by the Russian intelligence agencies but by regular Russian military forces. They've got a brigade from their far eastern military district that's been pulled all the way across Russia and assigned opposite the Ukrainian city of Kharkov in order to be able to intimidate and possibly even cross that border and intervene if the Ukrainians are very successful militarily. We don't know where this is going to go militarily, but nations in eastern Europe are anxious."
For more of our interview, watch the video above.