An escalating arms race between Russia and the U.S. is bad news for international security. But apart from Russia's recent withdrawal from the INF treaty, Simon Saradzhayn argues, Vladimir Putin's fixation on missile defense should also be cause for concern.

As Russia prepares for its annual strategic military exercises, speculation is mounting that the Zapad-2017 war games, set for Thursday through Sept. 20 in western Russia and Belarus, might be a prelude to war. Ukraine’s defense minister cautioned that Zapad could be a ruse to attack any European country “that shares a border with Russia,” while the New York Times proclaimed that the drills near NATO’s borders have raised “fears of aggression.” A CNN contributor wondered, “Could they turn into war?”

It is indisputable that the Ukraine crisis has dealt a serious blow to Russia's relations with core members of NATO. It would take many years for Moscow, Washington and Brussels to fully mend the fences even if the conflict in Ukraine were resolved tomorrow.

But as Russia's new military doctrine indicates, the Rubicon in NATO-Russian relations has not been crossed — at least not yet. While naming Russia's allies, the doctrine, which was published on Dec. 26, avoids designating either NATO as a whole or any of its specific members as adversaries.