[XorNot]

Putin delayed his invasion because COVID-19 was rampaging through the world at that time, and Russia had no access to an effective vaccine while being well...Russia, so it went about as well as you'd expect for their military readiness.

Disease killed more people on the frontlines in WW1 then weapons did, and it is the foolish military planner who doesn't try to avoid it (the Russian lines are currently dealing with an outbreak of Cholera in parts, which is another problem partly as a result of training quality - effective military's drill field hygiene practices because it's a direct contributor to combat effectiveness).

EDIT: i.e. when there's a novel respiratory virus about, nothing will destroy your military faster then massing for an invasion in one place.

[oh_sigh]

At the point COVID was around and known, it would already be too late, because there would be less than a year left in Trump's first term. If I was Putin and I had a useful idiot in the White House, I would start planning that in 2016 before he was even inaugurated.