American politics invaded the thread)
From my biased Ukrainian point of view, we don't need Trump to go back to an American president that will mishandle Russia badly. Any new one can make the situation worse. Let's look at the recent ones.
1) Bush 1.0: The guy who "wisely" decided to not finish communists and end the cold without trying to bring Soviet criminals to justice. What the America-led Western world did in 1991 is like alternative History in which the Nazi party was removed from power in 1944 and the Allies left Germany intact in exchange for some minor democratic reforms with no Nurnberg.
Also, as a Ukrainian, I remember Bush's speech in front of the parliament of Ukrainian Soviet Socialist Republicf that can be summarized with "Please, please, please, don't leave the USSR"
2)Clinton
Largely ignored Yeltsin's coup in 1993 and war crimes of the first Chechen War. Those were good enough to restart the Cold War and end it properly.
3) Bush 2.0
Oh... Where do I start? Ignored War crimes of the second Chechen War and resulting genocide. Ignored the rapid destruction of the free press in Russia. Invaded Iraq, creating an oil price hike that gave Russia sooooooo much money. And while I understand that he was a lame duck in 2008, USA's reaction to Putin's first open aggression was... tame.
4) Obama
Well, he started with a "reset" of relationships with Russia. I remember all too well Lavrov and Clinton smiling and pushing a big red button months after the aggression against Georgia. Then, when shit hit the fan in Syria, Obama demonstrated that USA's new reaction to ongoing genocide with WMD is drawing red lines.
There was a reaction to the first post-WW2 annexation in Europe but it was very... careful.
5)
Trump. Funnily enough, while being Putin's admirer, Trump didn't help Russia much. Not because he didn't want to but because other branches of the U.S. government didn't let him. The only major thing is breaking the deal with Iran, which allowed Russia to get more oil money and mitigate the effects of the sanction.