Clearly, the use of chemical weapons, especially in an invasion where there are a very large number of civilians, would be an outrage against humanity.
I would say to anybody in Russia thinking about this: do not cross that line, do not inflict any more misery and suffering on the Ukrainian people.
They’ve already been shooting civilians who are fleeing down humanitarian escape corridors, they’ve been bombing and shelling hospitals including a children’s/maternity hospital, do not go any further in inflicting misery on the Ukrainian people.
It will trigger an increased response from the West, there’s a dramatic increased response, there’s no question about that. I’m not going to speculate about the form that’s going to take or pre-empt it, but that’s a line that Russian governments should not cross.