Dick Lugar: “There has to come a time when it will be appropriate for us to withdraw.”

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...

Yes, I believe New START meets this threshold with one exception.