KIEV, Jan. 14 ??“ Naftogaz Ukrayiny, the national oil and gas company, seeks to acquire a 50% stake in RosUkrEnergo, a Swiss-based gas trader, that has been recently named the key gas supplier to Ukraine.

RosUkrEnergo, which operates gas supplies from Central Asia to Ukraine and to Europe, is 50-50 owned by Gazprombank and Raiffeisen Investments. However, both entities apparently act as custodian banks, while names of true owners of RosUkrEnergo have never been disclosed.