The situation is pretty clear and calmly explained by Linus in the quoted messages. They removed contributors from Russia. The main reason is that they were told by a lawyer that they need to do this due to international sanctions. The secondary reason appears to be that Linus is not a fan of what Russia is doing, and is OK with sending a message.
They made a call and were immediately swarmed by people trying to argue geopolitics, law, personal responsibility, transparency, and so on - many of whom aren't regular kernel contributors. Linus responded that he's not going to argue, and I can't blame him: it's a software project, not a discussion club. Sometimes, maintainers make the call and you suck it up, leave, or fork it. This is just that.