He also supplies huge amounts of gas to the EU's biggest supporter. That's right Germany. Based on that and what you typed above you must now consider the EU a really, really bad idea?
No, that doesn't follow. Supplying gas to the EU doesn't mean he supports the EU; it means that he is happy to make money from the EU, as well as having valuable blackmail potential. Putin is far cleverer than you seem to give him credit for.