"Russia has used chemical nerve agents from the 'Novichok' group in the past. The Russian people have a right to express their views without fear of retribution of any kind," deputy US Ambassador to the United Nations Cherith Norman-Chalet told a council meeting on chemical weapons in Syria.
"We urge Russia to cooperate fully with the international community's investigation," she said. "Those responsible – both those who committed this attack and those who ordered it – must be held accountable."