Dick Lugar: “Ultimately, President Assad is the head of state and he is responsible for the actions of those beneath him.”

That is a very dangerous attitude to take.

We need to be indicating our leadership with regard to NATO, with regard to our European alliances.

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

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.