Dick Lugar: “A major challenge for United States policymakers will be to convince Russia to bring transparency to its tactical…”

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

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.

There is precedent for using patient diplomacy to resolve treaty violations.

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