It's always difficult, of course, because Russia is one of the permanent members and has a veto, so they're going to ensure that action against Russia isn't taken via the UN Security Council. This is why the United Nations is so important, because we have something called a General Assembly, where all member states meet, and there can be sidebar conversations. I think all we can do is encourage conversations rather than drawing necessarily hard lines in the sand and saying that this is now where NATO takes over.
On November 22nd, 2017. See this statement in context.