Russian President Vladimir Putin’s renewed nuclear threats has raised fears that his plans for escalation in Ukraine may not be limited to mobilizing more troops. Whether Kyiv and its allies should now be more concerned about the threat was up for debate, analysts said. “Creating more ‘Russian’ territory is an attempt to scare the West because Russian nuclear doctrine has always maintained that nuclear weapons would only be used in defense of Russia directly. In fact, when Ukraine launched attacks on annexed Crimea this summer, a territory Moscow considers Russian, Putin did not reach for the nuclear button, O’Brien noted. And that victory, Putin hopes, could come through eroding Ukraine’s international support,” Giles said.