A U.S. delegation will travel to Moscow to look into allegations that Russia conducted mid-range missile tests. If they are substantiated, Russia will be found to be in violation of a 1987 anti-missile treaty that was a cornerstone of the institutional mechanism by which the Cold War nuclear standoff ended. From the New York Times:
At the heart of the dispute is the United States allegation that Russia has tested a ground-launched cruise missile in violation of the 1987 Soviet-American treaty banning intermediate-range missiles based on land. Russia began testing the cruise missile as early as 2008, according to American officials. The Obama administration first raised its concerns with the Russians in May 2013 and formally alleged that the test was a violation in July. […]Western experts say that nuclear weapons have assumed a larger place in Russia’s military doctrine to compensate for weaknesses in its conventional forces. President Vladimir V. Putin of Russia reinforced that impression last month when he highlighted Russia’s nuclear prowess in comments that appeared intended to dissuade the West from providing significant military support to Ukraine.
Yet Putin is not exactly quaking in his riding boots. He has sailed by all of the outs he has been given by the West, whether they come with threats of new levels of sanctions or of delegations making treaty-ending decisions. Western leaders should have figured out by now that Putin does not care about or respond to anything but real (rather than nominal) power. He is a revisionist, and we can expect to see him continue to subvert the institutions that were put in place to keep the post-Cold War world order in place. Anybody who does not expect that is going to fail to understand him, and therefore fail to thwart him.