Petro O. Poroshenko, a former president, returned to Kyiv on Monday facing possible arrest, adding internal political turmoil to a threat of Russian invasion. Ukraine’s former president and a leading opposition figure, Petro O. Poroshenko, returned Monday to Kyiv, where he faced possible arrest on charges of treason, adding internal …

The Turkish government has given the go-ahead for the mass production of the country’s indigenous basic trainer and light-assault aircraft. The decision for serial production of the Hurjet was taken at a Jan. 12 meeting of Turkey’s ultimate decision-maker on defense procurement, the Defence Industry Executive Committee. The meeting was …

The slow evacuation may be part propaganda, part preparation for a conflict or part feint, Ukrainian and U.S. officials say. It could be all three. The week before intensive diplomatic meetings began over the buildup of Russian troops on the Ukrainian border, American and Ukrainian officials watched from afar as …