Today President Obama kicks off a week-long trip to Russia, Italy, and Ghana. He’s currently in Moscow, meeting with President Medvedev. Iran, North Korea, and plans for a U.S. missile defense system in Europe are all on the agenda, but reducing the number of strategic and other nuclear weapons gets top billing. Presidents Obama and Medvedev aim to negotiate a new pact to replace the 1991 Strategic Arms Reduction Treaty, which expires in December. To gauge how effective this negotiation will be—and for a look at how this summit could redefine U.S.-Russia relations, we turn to Ambassador John Bolton. He is Former U.S. Ambassador to the United Nations. He is currently a senior fellow at the American Enterprise Institute.