Number one, we should be watching troop movements. The most recent Russian troop movements, with their latest military exercise called Zapad this past summer, were very troubling. The escalating number of Russian troops in Belarus on the Ukrainian border and the border with the Baltics was very troubling. We should be watching for those kinds of metrics and raising red flags right away, because we can't sit back and say that we need to engage with Russia but then allow them to amass hundreds of thousands of troops on the borders of these sovereign countries in efforts to destabilize the situation.
On October 23rd, 2017. See this statement in context.