I’m a European leftist and I would say that conservatives and liberals have a big overlap. In Germany, the conservative party likes to work with the liberal party best and the social Democrats with the Green party. None of these is really left from my perspective and all of them call themselves Center and are more or less liberal, but the green and obviously the liberals more than the others.
Same in Germany. To call yourself Right in Germany is, well, we had a very right wing government and we swore “never again”.
So the conservatives are center, the liberals are center, the social Democrats aren’t really left anymore and self identify as center and the same is with the green party. There is one party called The Left and they obviously identify as left but can’t agree on what that means. And the far right party (AfD) calls themselves Conservative.
I would argue that Russia was imperialist during the tsar empire, the Soviet union and today. It just never stopped exploiting their colonies (at least everything east of the Ural are colonies inhabited by indigenous communities not recognized in their fight for freedom) and the Soviet union smashed all the attempts to create a socialist community that was beyond bolshevism like the black army in Ukraine or the anarchosyndicalists in Spain. As a leftist myself I don’t see any reason to have solitary with Soviets and people who refere positively to them.
TERF (trans exclusive radical feminists) are basically transphobes who say “trans people are bad for women rights”.
Tankies are a bit more vague in usage. But basically these are self proclaimed socialists who are actually more into authoritarian leaders. They will appreciate Stalin for everything he did and defend North Korea’s political system. Sometimes even praise China and Russia for being “anti-imperialist”. So they have all the social backwards ideas, even more so than TERFS because why would they be feminists.