KIEV, July 30 – Kremenchuk-based UkrTatNafta, Ukraine's major oil refiner, has concluded a contract with a new oil supplier - Tekhnoprogres Ltd., UkrTatNafta Chairman Serhiy Hlushko told Interfax-Ukraine.

"On July 25 we concluded a contract with a new oil supplier – Tekhnoprogres. We were forced to suspend cooperation with a previous supplying company (Avto small-scale collective private enterprise), as there arose questions concerning its activities. We are waiting for the enterprise to provide the necessary documents," he said.