Continuing fighting gives more time to get those security guarantees. A peace is worth nothing without them.

A peace deal or ceasefire could at least allow individual countries to send peacekeepers independently of NATO

That’s assuming that’s the sort of peace deal or ceasefire Russia would agree to.

And if a ceasefire ends up being just a chance to regroup, then at least Ukraine gets that chance as well.

Not only would that give a better position for Russia who has better means to regroup with Ukraine’s support faltering, for that too, that’s assuming that’s the sort of peace deal or ceasefire Russia would agree to.

If Russia did say that we should just pause the fighting, I’d imagine Ukraine would go for that. But it’s not likely Russia is going to do that when they have the upper hand.