some other countries try to stay diplomatic so talks are still possible when russia is ready to surrender. they have professional politicians who hold back instead of lashing out, even if they want to.

also, many countries didn’t expect war and were low on war supplies. then many of them are also giving their supplies to Ukraine and have even less, but can probably still defend against russia or others, but it’s more risky. in that situation they ask that their weapons aren’t fired into russian territorry for two reasons: (1) so russia has less reason to attack them in their slightly weakened state and (b) so russia can’t find parts of their weapons and develop countermeasures or copy their tech.

russia knows this, of course and they are losing the war. it’s just the question how many years it will take. so because of reason 1 they try to threaten the Ukraine supplier countries to stop them sending weapons. And those countries know it’s outrageous how russia behaves, but their politiciancs act cool and won’t call out the insanity, so negotiations for russias surrender will be possible as soon as possibble.