Ukraine's arms firms walk tightrope between Kiev and Moscow Thomas Grove 8 MIN READ KRAMATORSK Ukraine (Reuters) - In quiet defiance of a promise by Kiev's pro-European government to cut arms ties with Moscow, a state-owned defense firm in eastern Ukraine has vowed to work around the clock to fill every Russian order it gets. As for many of Ukraine's defense firms, the stakes are high for Yuzhmash, an industrial behemoth that was so jealously guarded by the Soviet Union that the nearby city of Dnipropetrovsk was closed to foreigners until the bloc split apart. Now, in the face of...