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US Ambassador to the United Nations Samantha Power sets a candle to the memorial for Heavenly Hundred, the Ukrainian demonstrators killed during the protests in Maidan square at the end of 2013-beginning of 2014, in Kiev on June 10, 2015 during her visit to Ukraine. Washington's UN ambassador meet Ukraine's President Petro Poroshenko at a time of renewed hostilities with pro-Russian fighters and fears of the Western-backed state's imminent debt default. AFP PHOTO/ YURY KIRNICHNY (Photo credit should read YURY KIRNICHNY/AFP/Getty Images)

US Ambassador to the United Nations Samantha Power sets a candle to the memorial for Heavenly Hundred, the Ukrainian demonstrators killed during the protests in Maidan square at the end of 2013-beginning of 2014, in Kiev on June 10, 2015 during her visit to Ukraine. Washington's UN ambassador meet Ukraine's President Petro Poroshenko at a time of renewed hostilities with pro-Russian fighters and fears of the Western-backed state's imminent debt default. AFP PHOTO/ YURY KIRNICHNY        (Photo credit should read YURY KIRNICHNY/AFP/Getty Images)