If we reason hypothetically, then of course Putin, given his longer political career, would be more likely [to eliminate opponents]. If we start looking for evidence, it might end up like the case of Hunter Biden's laptop, which Russia had nothing to do with, but over 50 FBI agents were fired for lying about it, among other things.
If you think Putin is the first or only one willing to harshly eliminate his opponents, you are very mistaken.
MOSSAD is an example of this!