A threatened State, according to long-established international law, can take military action as long as the threatened attack is imminent, no other means would deflect it and the action is proportionate.
Discussing the conditions under which states may use military force without UN authorization.
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More from Dick Lugar
The reasons for Russia's violation are unclear. But I believe the violation was likely due to a number of factors...
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.
The President has to want to get back into the discussions. At this point, there is not evidence that that is the case.
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