Authorities arrested Volodymyr Ruban, 50, while he was allegedly trying to smuggle an arsenal into government-controlled territory in the Donbas on March 8. KYIV – Authorities detained a decorated prisoner exchange negotiator with alleged ties to U.S.-sanctioned Viktor Medvedchuk on suspicion of preparing crimes and terrorist acts, as well as arms smuggling. Volodymyr Ruban, 50,...