This image — taken via satellite in January 2015 — depicts what the State Department says is the crematorium at Saydnaya prison, including snowmelt on the facility's roof that acting Assistant Secretary of State for Near East Affairs Stuart Jones says is proof of the building's higher temperature. State Department/DigitalGlobe hide caption
"What the American Founding Fathers understood was that institutions were built for human imperfection, not human perfection," Condoleezza Rice says. Ariel Zambelich/NPR hide caption
Secretary of State Rex Tillerson in the George C. Marshall room at the State Department on Thursday. Ariel Zambelich/NPR hide caption
U.S. Secretary of State Rex Tillerson, pictured in Moscow last week, says Iran has been abiding by a 2015 nuclear agreement. But he told Congress in a letter that the Trump administration was reviewing the lifting of U.S. sanctions against Iran to determine if that was in U.S. interests. Ivan Sekretarev/AP hide caption
Secretary of State Tillerson speaks with the media after he greeted Chinese President Xi Jinping on April 6 in West Palm Beach, Fla. Joe Raedle/Getty Images hide caption
Secretary of State Rex Tillerson shakes hands with Russian Foreign Minister Sergey Lavrov at the start of their meeting in Moscow. Russia has accused the U.S. of breaking international law with its missile strike on Syria last week. Alexander Nemenov/AFP/Getty Images hide caption
Secretary of State Rex Tillerson sits at a table surrounded by foreign ministers from G-7 countries on Tuesday, the second day of a meeting in Lucca, Italy. Tillerson headed to Moscow later that day for the start of a series of what promise to be some tough conversations. Vincenzo Pinto/AFP/Getty Images hide caption
U.S. Secretary of State Rex Tillerson waits for the start of a meeting last month at NATO headquarters in Brussels. Tillerson is scheduled to travel to Russia on Tuesday, in what promises to be a difficult round of talks after the U.S. missile strike in Syria last week. Virginia Mayo/AP hide caption
Secretary of State Rex Tillerson appeared at a joint news with Turkish Foreign Minister Mevlut Cavusoglu in Ankara on Thursday. Adem Altan/AFP/Getty Images hide caption
Secretary of State Rex Tillerson speaks Wednesday at the meeting of the Global Coalition on the Defeat of ISIS in Washington. Top officials from the 68-nation coalition are looking to increase pressure on ISIS. Cliff Owen/AP hide caption
Secretary of State Rex Tillerson, seen here during his trip to China on Saturday, will travel to Russia next month. Lintao Zhang/AP hide caption
U.S. Secretary of State Rex Tillerson, upon arriving at the Osan Air Base in South Korea last week. NurPhoto/NurPhoto via Getty Images hide caption
Secretary of State Rex Tillerson (from left), Mexican Foreign Minister Luis Videgaray and Mexican Interior Minister Miguel Angel Osorio Chong greet each other during a news conference in Mexico City on Thursday. Ronaldo Schemidt/AFP/Getty Images hide caption
Secretary of State Rex Tillerson visited Germany last week and heads to Mexico this week, amid growing questions about how much influence he has in the White House. Brendan Smialowski/AP hide caption
"We're not expecting a road covered with roses in our bilateral relations, though clearly there's a window of opportunity," Konstantin Kosachyov told a group of academics and former diplomats in Moscow this week. Maxim Zmeyev/Reuters hide caption