They are all pro Russian regions, no one cares. Actually, it was mostly Obama that set the trend in the US, as he couldn't give a toss. And whilst yeah, Trump did nothing, at least he didn't say that Ukraine was a core interest of Moscow, and they shouldn't be in NATO being so close to scary Russia. You want to assign blame? There's a far, far greater argument against the saintly, Nobel Peace Prize winner for the state of the world than Trump right now, with his naive foreign policy and 'red line' bluster. And as if Trump would have pulled out of NATO by the way. If it comes to it, the yanks control NATO forces, and with the alliance near dominating Europe, it would be weaker to sever themselves from it given their geographic isolation. It was nothing more than political grandstanding to win votes.
And what could he do about China building islands? Send in the navy and blockade all the dredgers in their own backyard, raising tensions in one of the busiest trade regions in the world? Would be a pretty stupid thing to do... If he's as dumb as you claim, I'm wondering why he didn't do just that? In sensible terms that were clearly recognised, it is a vital sea corridor to the Middle East the US needs, and it's more important than China building big sandcastles and bullying out foreign fisherman. Yes, they are breaking some international maritime laws etc, but really, like they care as whose gonna stop them anyway? The US is probably scared of China's military capabilities in anti-ship ballistics and supersonic missiles, and rightly so too in that scenario.
But at least Trump did have his boot on their neck through other means. Trade tariffs, reviving relations with Taiwan, 'China Virus'. Unlike Biden, who is nervous as cats when it comes to China, for better or worse, Trump took a real hardline that was needed. And every country with a bee in their bonnet probably flies into another sovereign's airspace from time to time. Russia will send the odd one here, but never dozens of warplanes in a show of force. So as I've said, that didn't happen on Trump's watch because he's too busy smack talking China, or talking of 'totally destroying' North Korea in front of the UN or wherever it was. I mean, does that sound like someone you want to trifle with, threatening the obliteration of another country who calls their leader 'rocket man'. It's hilariously undiplomatic, the guy just didn't give a ****.
Didn't actually happen, of course, but despite that, you still think he'd put us on course for WW3. Why? Rallying a mob of peasants is hardly in the same league as starting nuclear armageddon. Same as all his belligerent finger pointing and combative attitude on the world stage. Whether you like it or not, it projects strength, which is kinda mandatory for the #1 military of the world. Instead, you would prefer sleepy Joe, who on a good day with all his marbles is nothing more than the wet lettuce we can't have. The US media might not report on it, but the Australian press eat him alive on a daily basis. I presume that's still the case, although I've not seen any for a while now, as his constant incoherent bumbling speeches and inability to exhibit any kind of leadership became too irritating to watch, given how it is perceived internationally.