To start, Putin grew up and had his career in the old communist Soviet Union, and has made clear he thought it was absolutely wonderful. Now the USSR was a superpower, with 350 million people, the world's second largest economy, a military equal to that of the US, and it controlled Eastern Europe through communist puppet governments.
Then in 1989-91, the Eastern European nations threw out the communist governments and broke away, communism was abandoned, all the non-Russian republics broke away from the USSR, and the military declined drastically. Now Russia has only 145 million people, much less territory, no solid allies except Bylarus, a military about one-fifth the strength of the US, and it's economy is ranked 10th in size.
Putin has made clear that he wants to get back to superpower status, and to do that he has to take back a lot of territory, either through incorporation into Russia or as allies. He can't do that with the Central Asian former Soviet republics, partly because they are semi-allies of China. So he is trying to expand westward, and doesn't care at all that most of the population of the Eastern European nations want to stay aligned with the West.
And to do this he uses various means such as military threats, sending in military forces, trying to undermine democratic governments through supporting extreme left and right wing parties, and a massive internet trolling campaign.
Well, that is my view. What is your view? Where do you think Putin is trying to go in the long term, and what sort of means do you think he uses?