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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Turkish President Recep Tayyip Erdogan and NATO Secretary General Jens Stoltenberg (left) met in Istanbul Monday. Anadolu Agency/Getty Images hide caption

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Anadolu Agency/Getty Images

Stark Choice For NATO's Turkish Officers: Arrests At Home, Limbo In Europe

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U.S. military planes drop paratroopers during a multi-national jump that includes soldiers from the U.S., Britain and Poland on June 7, near Torum, Poland. U.S. President-elect Donald Trump has questioned the value of the NATO alliances, raising worries among many European countries. Alik Keplicz/AP hide caption

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Alik Keplicz/AP

What Does Trump's Victory Mean For NATO?

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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warships traveling with the aircraft carrier were planning to refuel at the Spanish port of Ceuta, but Russia has withdrawn its refueling request.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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Turkish special force police officers stand guard next to a banner picturing the late Mustafa Kemal Ataturk (left) and Turkish President Recep Tayyip Erdogan as people wave Turkish national flags during a rally this week in Istanbul against the failed July 15 coup. Bulent Kilic/AFP/Getty Images hide caption

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Bulent Kilic/AFP/Getty Images

Russia recently introduced a new frigate, the Admiral Grigorovich, and invited journalists on board at the Russian base in Sevastopol, Crimea. While the Russians have had a naval base in Sevastopol since the 18th century, Russia's seizure of the entire Crimean Peninsula from Ukraine in 2014 has heightened tensions with NATO. Corey Flintoff/NPR hide caption

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Corey Flintoff/NPR

The View From A Russian Frigate In Crimea

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A U.S. military policeman stands in front of Air Force fighter jets that were part of a NATO show of strength in Romania in April intended to deter Russian intervention in Ukraine. Andreea Alexandru/AP hide caption

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Andreea Alexandru/AP

U.S. soldiers carry a 155 mm artillery round for a live-fire training exercise during the Anakonda war games near Olezno, Poland, on June 14. Sgt. Ashley Marble/55th Combat Camera via DVIDS hide caption

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Sgt. Ashley Marble/55th Combat Camera via DVIDS

NATO War Games In Poland Get Russia's Attention

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A MiG-21 fighter — a leftover monument from the Soviet era — is the centerpiece of the Aviators Neighborhood in Deveselu, Romania. Now the base has become a U.S. Navy facility that is part of NATO's anti-missile shield for Europe. Gabriel Amza for NPR hide caption

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Gabriel Amza for NPR

NATO on Thursday ordered a naval force to move immediately to the Aegean Sea to help end the deadly smuggling of migrants between Turkey and Greece. In this photo from last June, a Greek coast guard vessel arrives carrying migrants at the port of Mytilene, Greece, after a rescue operation. Thanassis Stavrakis/AP hide caption

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Thanassis Stavrakis/AP

Standing beside his country's flag, Foreign Minister Igor Luksic of Montenegro attends a news conference after Wednesday's meeting at NATO headquarters in Brussels. Eric Vidal/Reuters /Landov hide caption

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Eric Vidal/Reuters /Landov

The burned Doctors Without Borders hospital is seen after explosions in the northern Afghan city of Kunduz on Saturday. Doctors Without Borders says 12 staff members and 10 patients were killed in the attack and 37 others were wounded. AP hide caption

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AP