If there is evidence that Soros funded the coup, then Putin could take it up with the International Criminal Court in the Hague. And it has to be specific targeted funding because Soros and his ring fund lots of things.
If Putin would resort to prosecuting Soros, he would have deep and widespread support in the USA and the world because Soros is hated everywhere.
Putin would be well-justified in protecting his bases along the Crimean just as the US is for Guantanamo. But beyond that he should voice his opinion and condemnation to the UN and refrain from acting as Hitler did with the Sudentenland.
But Putin has just botched the worldwide support and respect he gained for Russian values with his anti-homosexual stand at Sochi because people everywhere in the world are against normalizing homosexuality. Putin is not as smart as he thinks he is.
I highly doubt putin really cares what the west, or for that matter or the rest of the world thinks of him. Putin saw an oppurtunity, and encouraged by a weak America ran by a weak and corrupt government, took it. The Ukraine will fall back under Russian control, and Europe along with the west, are powerless to stop it.