The U.S. is helping plan how to keep homes and businesses heated during winter as the European Union’s incoming chief diplomat warned the government in Kiev may struggle as freezing temperatures approach. Fighting continued today in eastern Ukraine amid moves to establish a buffer zone to help cement a wobbly truce that went into effect a little more than a month ago between government forces and pro-Russian separatists. “We have a team in Ukraine looking at the immediate issues of this winter,” U.S. Energy Secretary Ernest Moniz said yesterday at the Council on Foreign Relations in New York. “The issues are, unfortunately, challenging.” Analysts are studying ways to heat homes with fuels other than natural gas, he said. Ukraine is bracing for the onset of winter, when temperatures at times drop below minus 20 degrees Celsius (minus 4 degrees Fahrenheit), with Russian gas supplies shut off and energy infrastructure […]