Leave them to talk and sort it out , which they are doing. In the meantime use sanctions and stop all the macho posturing,
Are your boots on the ground yet or are you being brave from a great distance and hoping that other people go die on your behalf ?
Innocent people, men, women of all ages, children are being indiscriminetely murdered daily. They didn't sign-up for that.
If you sign-up for the military, fighting and death goes with the territory.
HOWEVER, my point was that had NATO learned from the annexation of Crimea and heavily mobilised (learning from Putin's playbook) we might not be in this mess at all. And assuming Putin invaded anyway, having the full weight of NATO forces opposing Putin, might have saved a lot of innocent lives.
The longer this goes on, the bigger the bloodbath....