Russia on Friday stopped coal deliveries to Ukraine, part of an escalating series of tit-for-tat measures sparked by a recent attack on electricity transmission lines that cut off power to Crimea, annexed by Moscow last year.
Russia's War Against Ukraine
Politico: Coal cutoff escalates Russia-Ukraine tensions
People walk along a street during a power outage in the Crimean city of Simferopol on Nov. 23, 2015.
