Russia is a rouge country. They have used phosphorus before. If there is any kind of weaponry banned Putin doesn't care.

Putin uses other kinds of incendiary weapons, such as thermite. When the US banned incidiary weapons on civilians, the UN drafted a treaty. Russia signed that treaty. Russia likes to appear to be a benevolent country when in fact it is a rouge country that disregards international order.

The communists like to see "stable states," but, if it serves their purpose to destroy and kill, they will do it.