Ukrainian servicemen stand guard on a street near a burning building after a shelling by pro-Russian rebels of a residential sector in Mariupol, eastern Ukraine, last month. Reuters /Landov hide caption

itoggle caption Reuters /Landov

A child plays near Russia-backed separatists in Donetsk, Ukraine, Monday. Separatists say they've begun to withdraw heavy weapons from the front line — a claim that monitors say they can't verify. Vadim Ghirda/AP hide caption

itoggle caption Vadim Ghirda/AP

Ukrainian troops ride on self-propelled artillery near Artemivsk, eastern Ukraine, Monday. A Ukrainian military spokesman says that separatist attacks are delaying Ukrainian forces' pullback of heavy weapons from the front line. Evgeniy Maloletka/AP hide caption

itoggle caption Evgeniy Maloletka/AP

A worker at Soulis Furs in Kastoria sorts through treated mink pelts. "We buy the pelts — minks or foxes or other animals — from North America and Scandinavia and send them for treatment in factories or abroad," says Makis Gioras of Soulis Furs in Kastoria. Joanna Kakissis/NPR hide caption

itoggle caption Joanna Kakissis/NPR

Britain's Foreign Secretary Philip Hammond and Secretary of State John Kerry deliver a statement at a news conference in London, today. Kerry said the two were going to discuss the possibility of further sanctions against Russia amid cease-fire violations in eastern Ukraine. Neil Hall/AP hide caption

itoggle caption Neil Hall/AP

In this photo provided by Britain's Royal Air Force, taken Oct. 29, 2014, a Russian military long-range bomber aircraft photographed by an intercepting RAF Typhoon flies in international airspace. Robyn Stewart/AP hide caption

itoggle caption Robyn Stewart/AP

Ukrainian soldiers repair their truck's bullet-shattered windshield Thursday, hit during their withdrawal from Debaltseve Wednesday. Brendan Hoffman/Getty Images hide caption

itoggle caption Brendan Hoffman/Getty Images

Yakutsk, Russia is the world's coldest city: average winter temperatures hit -30 degrees. It's also the largest city built on permafrost. Amos Chapple hide caption

itoggle caption Amos Chapple

A Ukrainian military convoy stops on the road between the towns of Debaltseve and Artemivsk, Ukraine, on Saturday, hours before a cease-fire agreement is set to go into effect. Petr David Josek/AP hide caption

itoggle caption Petr David Josek/AP

A Ukrainian government soldier waves to an armored vehicle on a road near the town of Artemivsk, Ukraine, Friday. Fighting between Russia-backed separatists and Ukrainian government forces has continued despite the agreement reached by leaders of Russia, Ukraine, Germany and France in the Belarusian capital of Minsk Thursday. Petr David Josek/AP hide caption

itoggle caption Petr David Josek/AP

Russian President Vladimir Putin waves as he leaves a Ukrainian crisis peace summit in Minsk, Belarus. After hours of talks, Russia and Ukraine reached a deal for a cease-fire in eastern Ukraine. Tatyana Zenkovich/EPA/Landov hide caption

itoggle caption Tatyana Zenkovich/EPA/Landov

Russian soldiers guard the entrance to the Ukrainian military base in Perevalne, Crimea, last March. Russia was criticized widely internationally after seizing the region. Now Russian lawmakers are considering a bill that says Crimea was illegally given to Ukraine in 1954 and should have been part of Russia all along. Ivan Sekretarev/AP hide caption

itoggle caption Ivan Sekretarev/AP

Ukrainian President Petro Poroshenko, left, German Chancellor Angela Merkel and U.S. Vice President Joe Biden, background right, arrive for a meeting in Munich, Germany on Saturday. Matthias Schrader/AP hide caption

itoggle caption Matthias Schrader/AP

People wait on a bus to leave the town of Debaltseve, Ukraine, on Friday to escape the heavy fighting. Nearly 1 million Ukrainians have been displaced by battles between pro-Russian insurgents and government troops. Petr David Josek/AP hide caption

itoggle caption Petr David Josek/AP