Russia has just vetoed a resolution proposed jointly by the US, UK and France. The resolution would have condemned Syria for a chemical weapons attack near Idlib.
US Ambassador to the UN, Nikki Haley become unhinged and threatened that the US may take action unilaterally in light of the resolution being vetoed. If this means military action against the government of Syria, this of course would be a violation of international law.
Even though Russia and Iran had nothing whatsoever to do with the incident she also blamed Moscow and Tehran, accusing them of not being interested in peace.