Dick Lugar: “I am concerned that the United Nations is beginning to fail to follow up on the significant progress made by the…”

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.

Jettisoning treaties that provide a legal framework for exposing Russian violations achieves nothing.

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