Von Der Leyen appears to be the exception but then there were no other candidates when she "won" that initial election or the recent one.
Pretty much every single other western leader has had to resign, was forced out or the entire government collapsed.
Well Putin is waging information war, massive hackings etc., against us, so that might have an impact.
Or it's just confirmation bias on your part.
Biden's decision has nothing to do with Ukraine and everything to do with him being senile and enough in his party no longer thinking he can win because of that and/or not wanting to hide the fact anymore.
In the UK, the Tories had been in power since 2010 and were not popular even before the start of the 2022 Ukraine war, them losing isn't surprising.
I could continue.
And if you're making the reverse argument that Putin's friends, most of them dictators, are still in power, well...they're dictators.