He has poured considerable amounts of time and money and other forms of backing into regime change in a number of NATO members; he extensively backed Le Pen and Zemmour, Trump (and enjoys public support from a number of US senators), has close ties to Gerhard Schröder, and of course has extensive networks in the British Conservative Party - sufficient for the current Prime Minister to appoint a Russian as a member of the House of Lords over the objections of British intelligence agencies - and Brexit.
It only takes one of those to pay off at the right time.
I can't speak about other countries but the idea that Russia could use its influence to convince the UK to veto Finland or Sweden's entry into NATO is absurd. The Conservatives may have been happy to take russian money before the invasion but it would be hard to do so now and political suicide to be seen as bowing to russian political interests.
Yep. Anyone doubting that Putin actively funds and influences right wing politicians in the West needs only to look at Putin's state spokesman, Dmitri Peskov's daughter, Elizaveta, is an assistant to far-right French politician Aymeric Chauprade, a French Member of the European Parliament.
It only takes one of those to pay off at the right time.