Your post has zero perspective.  Every major engagement and stabilization effort the United States has engaged in the eastern hemisphere has required Russia in one of the seats. All of them.  Putin is rational, calculated, and showed the diplomatic restraint, here: when Obama lazily and hastily imposed economic retribution and shut down Russia's two recreational spy facilities in retaliation for some hacking, Putin responded by doing....nothing.
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The French, the Israelis, The Chinese, the Russians-  at this point literally every countries leaders are just counting down the days when they can finally talk to one of the big boys and start doing business with our new President. Some like Korea and Taiwan already jumped the gun and got in hot water for it-- it's simply indicative of the eagerness they have in talking with someone other than this failed administration.