There is no such thing as moral obligation when it comes to politics and national interest. If it’s your country, then it’s your job to defend it or whatever. So far it doesn’t seem to be serving their self interest supporting an endless war.

There is no such thing as moral obligation when it comes to politics and national interest.

There is if you ever want to negotiate a nuclear arms-control deal again. None of this would be an issue if Ukraine had kept their nukes.

Their self-interest is in keeping Putin at arms length and avoiding WW III. Putin is already threatening Lithuania, sending drones into Poland. If Putin wasn't prevented from taking Ukraine, do you really think it would end there?