Dick Lugar: “Well, these covenants that you would place on the FCMs, as you say, does not, once again, offer 100 percent confidence.”

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.

Congress could condition funding to develop new missiles on receipt from the administration of a comprehensive military, economic, and diplomatic strategy to bring Russia back into compliance with the treaty.

Several members of Congress have already proposed legislation along these lines.

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