Putin on Syria and International Law

You will likely have heard about President Putin's op-ed in The New York Times. The reaction within the U.S. was fairly universal in its condemnation, largely due to the perceived hypocrisy in Putin's remarks. But take a read, and give some thought to what he has to say about international law, and keep it in mind when we get to "use of force". Is he wrong? If so, how exactly?