Some new bits in this story. In an interview, Dmitry Rogozin indicates he's unhappy with all the "debris scattered across the orbit" from Russia's ASAT test and says its unlikely the Russian military will test-launch another one in the future.
Also - the State Department is considering calling for an antisatellite test moratorium, possibly during the Conference on Disarmament in Geneva next year, per two US officials.
A day before the ASAT test, senior NASA officials flew to Moscow to negotiate two key ISS agreements, meeting with Rogozin for dinner at one point. They echoed Nelson's condemnation of the test, and "it was a very productive discussion,” Cabana says.
Nelson strongly condemned the RU military's ASAT test, but speculated that his counterpart Rogozin didn't see it coming. Indeed, in the interview, Rogozin said Roscosmos wasn't consulted prior. But he added: “I’m not going to tell you everything I know.”