And what disturbances do you mean?
This very article seems to be a prime example. Yes, NATO spending is up, and because of Russia conducting a violent unprovoked invasion of a sovereign territory in their area, and a general reduction in confidence that they can rely on USA and must fend for themselves. Trump's schtick is mostly 'America shouldn't help so much, fend for yourself'. Even with somewhat elevated spending, would that offset the loss of capability that would come with the US just failing to live up to their NATO obligations when the time came?
Why would Putin kick off the Ukraine war immediately after his “agent” leaves office?
Because things were going to be as good as he could get them and the best opportunity was before the new administration could reverse course? In the most favorable Russia outcome, Trump might have followed through on threats to further reduce NATO contributions, but with Trump gone and a more NATO-friendly admin in place, things were going to get worse for Putin before they could get better. I vaguely recall some non-US situations that similarly could have greased the wheels for an easier annexation of Ukraine, so it's not like the US is the only factor in such timing anyway, but don't recall what specifics made me think of that.
Trump is not a Russian asset. He’s an easily-manipulated businessman
I will agree that it's not a straightforward "Trump is a Russian agent", but an "asset" is not an agent. He's a convenient "friend" that is easily manipulated/bribed. He doesn't have loyalty or anything like that to Putin, but he is plainly easy to manipulate, and Putin's circle has been consistently in position to do that manipulation for decades. Others may be no saints, but Trump is comparitively easier to mess with because of just being terrible at the things he purports to be good at.
the TLS-ALPN-01 challenge requires a https server that implements generating a self-signed certificate on demand in response to a specific request. So we have to shut down our usual traffic forwarder and let an ACME implementation control the port for a minute or so. It's not a long downtime, but irritatingly awkward to do and can disrupt some traffic on our site that has clients from every timezone so there's no universal '3 in the morning' time, and even then our service is used as part of other clients '3 in the morning' maintenance windows... Folks can generally take a blip in the provider but don't like that we generate a blip in those logs if they connect at just the wrong minute in a month...
As to why not support going straight to 443, don't know why not. I know they did TLS-ALPN-01 to keep it purely as TLS extensions to stay out of the URL space of services which had value to some that liked being able to fully handle it in TLS termination which frequently is nothing but a reverse proxy and so in principle has no business messing with payload like HTTP-01 requires. However for nginx at least this is awkward as nginx doesn't support it.