Biden apologizes to Zelenskyy for monthslong congressional holdup to weapons that let Russia advance

Why? It can be both. I'd say it's understood as both tbh.

If you want Ukraine to win, then you want Russians to die.

So in a choice between arrest and killing innocents, choosing to kill innocents is moral somehow?

Whoosh!

That's literally the point: he can't. His apology is useless.

The point of an apology is to acknowledge a mistake and signal that you will attempt to change your behaviour to prevent or avoid that mistake in the future.

A really good apology will also identify the steps that will be taken to avoid the mistake going forward.

I argue that if you don't or can't make an attempt to change your behaviour, your apology has no meaning. That is, the apology is not sincere and therefore not useful.