Russia's new Iskander system can be armed with nuclear warheads and can fire either ballistic (pictured) or cruise missiles. The Iskander-M missile launcher was used during a military exercise last month by the Russian Eastern Military District's 5th army at a firing range in Ussuriysk, Russia. Yuri Smityuk/TASS via Getty Images hide caption

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Yuri Smityuk/TASS via Getty Images

A Russian resupply rocket launched Thursday morning from Kazakhstan. The flight initially went as planned, but the rocket broke up in the atmosphere about six minutes after it took off. NASA TV hide caption

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NASA TV

An Estonian soldier takes aim during a training exercise at Tapa Army Base, Estonia, on Nov. 17. U.S. troops were also taking part in the training, about 70 miles from the border with Russia. NATO countries are stepping up their presence in Eastern Europe at a time of rising tensions with Russia. Lucian Kim/NPR hide caption

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Lucian Kim/NPR

Near The Russian Border, U.S. And NATO Beef Up Their Presence

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Chebureki, thin, deep-fried pockets of cheese, meat or mushrooms, are a best seller at Musafir. The Tatar restaurant has become an asylum-seeker of sorts in Kiev, the Ukrainian capital, in the wake of Russia's annexation of Crimea. Courtesy of Musafir hide caption

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Courtesy of Musafir

Egypt's President Abdel-Fattah el-Sissi (left) and Russian President Vladimir Putin meet at the Kremlin in Moscow last year. Both leaders have been quick to congratulate U.S. President-elect Donald Trump. Alexander Zemlianichenko/AP hide caption

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Alexander Zemlianichenko/AP

Russian President Vladimir Putin speaks at the Kremlin on Wednesday. Putin says that Moscow hopes to restore good relations with the United States in the wake of the election of Donald Trump. Sergei Karpukhin/AP hide caption

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Sergei Karpukhin/AP

A picture taken on April 20, 2010, shows a Russian nuclear-capable Iskander ballistic missile launcher during a military parade rehearsal outside Moscow. Russia transferred Iskander-M missile launchers within range of three Baltic states earlier this month. Alexander Nemenov/AFP/Getty Images hide caption

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Alexander Nemenov/AFP/Getty Images

'A Dangerous Situation' As U.S.-Russia Tensions Spill Over To Nuclear Pacts

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The Russian aircraft carrier Admiral Kuznetsov passed through the English Channel near Dover, England, on Friday. Several warships traveling with the aircraft carrier were planning to refuel at the Spanish port of Ceuta, but Russia has withdrawn its refueling request. Leon Neal/Getty Images hide caption

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Leon Neal/Getty Images

Russian President Vladimir Putin listens during the opening session of the newly elected State Duma, Russia's lower house of parliament, in Moscow. The U.S. blamed the Russian government for the hacking of American political sites and accused Moscow of trying to interfere with the upcoming presidential election. Alexei Nikolsky/AP hide caption

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Alexei Nikolsky/AP