KIEV, Ukraine — President Petro O. Poroshenko of Ukraine reached an agreement with Russia on Wednesday for a cease-fire in eastern Ukraine, the presidential office said in a brief announcement on its website. The Ukrainian announcement said the agreement had come during a telephone call with President Vladimir V. Putin of Russia. “The conversation resulted in an agreement on a lasting cease-fire in Donbass,” or eastern Ukraine, said the announcement, which consisted of three sentences. The two presidents agreed on the steps needed to establish peace, it said. No other details were given. But Dmitri S. Peskov, the Kremlin’s press secretary, said Mr. Putin had not negotiated a cease-fire with Mr. Poroshenko because Russia was not a party to the conflict in Ukraine’s southeast. “Putin and Poroshenko did indeed discuss steps which could facilitate a cease-fire between the militias and the Ukrainian military,” Mr. Peskov was quoted as saying […]