Dick Lugar: “Well, thank you very much, Mr. Chairman.”

It seems to me to be really a safety net there.

That is a very dangerous attitude to take.

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.

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