R.I.P. What he did was incredibly brave and foolhardy: traveling back to Russia to an almost certain death sentence. Well, if Russian democracy has a future, it will be thanks to people like him. Sadly, I expect short term repercussions to be mild given the miserable state of Russian civil society.
It is also worth contemplating that Tucker Carlson makes a fawning trip to meet Putin at the same time when the latter, in the midst of his invasion of Europe, kills off his most famous political opponent (whom he had previously attempted to murder). These are the same people who actively support Trump's efforts to undermine Western liberal democracy and the U.S. Constitution.