While troops were deployed to Belarus for “exercises”, there were lots of reports of them selling fuel and other supplies.

That could have complicated logistics for the invasion.

> Does Russia control the airspace or are the rumors true that Ukraine still has aircraft?

Hard to know for sure, since this is an information that really affect morale on either side (Knowing that you still have airplanes and that the Russians don't control the sky is really good for Ukrainian morale, and vice versa).

Russia claimed that their rockets destroyed Ukrainian planes and anti-aircraft defense in the first strike. And then they started loosing their own planes, tanks and trains to Ukrainian air forces. Planes simply weren't where Russians thought they would be, since there is large supply of leaks from Russian side, and Ukrainian military knew exactly when they would attack(they ended up striking an hour late tbh).

Majority of Ukrainian aircraft is intact. Drones are being used.

>Are there enemy teams with shoulder-launched missiles along the route?

Yes, and civilians are doing whatever they can to stop them.

>My impression is that the country is full of handheld antiair and antitank weapons, supplied by the west. That can't make it easy.

Yes. It's true, and more are coming.

And those that are coming are state-of-the-art. It is quite possible that they're going to be effective enough for one kill per weapon and the volume flooding in is going to go through the Russian armour like the clap.