Dick Lugar: “Well, that's good news.”

In the likely event the INF Treaty collapses in August, the only remaining bilateral U.S.-Russia arms control agreement would be New START, which expires in 2021 but can be extended by up to five years through agreement by both parties.

That is a very dangerous attitude to take.

The President has to want to get back into the discussions. At this point, there is not evidence that that is the case.

The reasons for Russia's violation are unclear. But I believe the violation was likely due to a number of factors...