It is a paradox situation, because while the design type certificate is held by the (Ukrainian) Antonov Design Bureau, the manufacturing (and heavy maintenance) license is held by the Ulyanovsk Aviation Plant (now Aviastar, Russia), where not surprisingly Volga-Dnepr is based. In the former USSR aircraft design and manufacture was done by distinct entities, the design bureaus had no manufacturing facilities, while factories were only for production, they had no R&D functions. When dealing with operational issues, the customer airlines liased with the manufacturing plant, not the design bureau. It was also the manufacturing plant who issued any Service Bulletins. I'm not privy to what certification regimes apply to the UR and RA registered Antonovs, but I would expect given the 'cordial' relations between the two countries, that completely separate ones.