If say the US gave a Nuclear warhead to the Ukraine and the Ukraine wiped out the CBD of Moscow with it, would the US be responsible?
If the US supplies long range missiles to the Ukraine which the Ukraine uses to bomb Russian cities, is the US responsible?
If China supplies Russia with long range missiles and Russia uses them to bomb Ukrainian cities , is China responsible?
The position of being neutral means consistency ; that is if" its good for the goose, then its good for the gander." International law is based on consistent principles...not bias.