Putin, as I said before, is a bandit chief. He's running a kleptocratic gangster state. Whatever flirtation with far-right ideology he does is purely instrumental to the real goal of kleptocracy.
This isn't good, but it means that Putin is fundamentally trying to maintain the status quo - he and his cronies robbing the Russian people and state blind. And that is why I say his strategic posture is defensive. All the 'offensive' stuff you listed is defensive in the sense that it is a response to (actual or perceived) encroachment by the West.
Really the Cold War was the same thing. The USSR's fundamental posture was defensive, not offensive, despite its various aggressive actions around the world. It couldn't have been otherwise given the vast power disparity between the US and the USSR. But for various reasons, most of them having to do with domestic politics, the political establishment in the US and the rest of the West portrayed the USSR as an immediate menace, a credible threat to the security of the West, bent on subverting and destroying the "free world."
Meh, while I agree with you general stance on what Putin is, you are basically mixing his actual behaviour with his claimed behaviour, which isn't really the same. Just because someone feels that he is acting defensively and needs a buffer to properly defend himself, doesn't mean that he is actually defensive in his behaviour. A paranoid stance that is afraid of outsiders coming to get you, which leads to an aggressive behaviour towards others, isn't really defensive. Otherwise you could proclaim basically everything to be defensive. US involvement in Vietnam, clearly defensive, to guard against the spreading of communism. Stalin taking over the baltic states, parts of Finland, etc. all defensive, because it works as a buffer against the Nazis. Heck, even the Nazis proclaimed to be defensive, in that they were protecting German minorities elsewhere or trying to take down the "judeo-bolshevik world-conspiracy" which in their view was trying to subjugate the world. Almost everyone tries to pretend that he is fighting for freedom or in defense against a threat to the own existance. Even those who fight aggressive wars of expansion proclaim those to be about defensive needs or for security.
Beyond robbing the own nation, I think Putin can be described by two things, paranoia and opportunism. In that way he is kind of like Stalin. There isn't a particular aggressiveness towards conquering for the sake of conquering, but there is an aggressiveness in the approach to "defense". There is nothing defensive about taking from others so that you feel more secure, so describing the whole approach as defensive isn't really fitting. It isn't offensive in the way of "taking more and more" either. It's a mix of these things.