Ukraine complained Wednesday that Russia has kept tens of thousands of troops not far from the countries’ border after war games, as part of its attempts to exert pressure on its ex-Soviet neighbor. The Ukrainian Defense Ministry’s statement marked an about-turn from its denial of any Russian military buildup — as reported in U.S. media — just two days earlier. The ministry said Wednesday that about 90,000 Russian troops are stationed not far from the border and in rebel-controlled areas in Ukraine’s east.