What a silly thing to say, and who should fight that world war? You do realize the UN is the reason WW3 has been delayed for so long? The UN is not an authority over nations, it's an organization meant to facilitate diplomacy. So, instead of Europe sanctioning the US in this case, they take action in form of a meaningful yet ineffective condemnation. It succeeded in avoiding diplomatic escalation.
The US is not special, extrajudicial killings happen all over the world, when was your UN replacement that will fix the world when this started in philippines in 2016? Syria? What will your replacement do, send troops? Sanction? The UN does that.
Ever heard of the term belling the cat? http://read.gov/aesop/003.html
