That’s why I specifically said Russia not USSR or the Soviet Union and also”president” of a recognised sovereign nation.
I’m fully aware of them taking people out, I like in UK where they took out one Russian and killed an innocent Brit when trying to take another person out.
But I’m talking about actual leaders of nations and since the fall of USSR, because of the diplomatic advances Russia has made in the since then and their change of tactics.
The "fall of USSR" is an arbitrary dividing line when the current leader of Russia was literally a KGB agent of the USSR for 16 years before its fall. Their assassinations of Afghan and Kazach leaders in the late 70s and early 80s were right in the middle of Putin's tenure in the KGB.
They haven't taken out many "actual leaders of nations" recently because they haven't been in full-scale conflict with that many national leaders. Most of their conflicts have been supporting their client state leaders against opposition movements, and they've taken out plenty of the leaders of those opposition. The one major full-scale war they've had besides Ukraine and the extremely short Georgia conflict was Chechnya, and they took out Chechnyan leaders left and right.