In this Jan. 15, 2015 file photo, U.S. Secretary of State, John Kerry, left, talks with Bulgarian Prime Minister, Boyko Borisov, before holding a joint news conference in Sofia, Bulgaria Thursday, Jan. 15, 2015. Kerry visited Bulgaria to push for a new gas spur and press an American company's bid to build a new nuclear plant there. Bulgaria relies on Russia for 85 percent of its gas and all of its nuclear power. Its prices, among NATO’s highest, are a concern within the alliance, which prides itself on winning the Cold War. (AP Photo/Rick Wilking, Pool)
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