OREANDA-NEWS. National Rating Agency has withdrawn its credit rating on RTI OJSC due to expiry of the contract. The company has been assigned an exit rating of ‘AA-’. RTI OJSC got NRA’s first-time credit rating of ‘AA-’ on July 3, 2013. The latest rating action on the company (the ‘AA-’ credit rating affirmation with a stable outlook based on the ‘RS2’ support rating, reflecting the probability of support from AFK Sistema.