On Wednesday, the international rating agency Moody's lowered Yukos and Sibneft's rating forecasts to a negative mark, according to Moody's official web-site.
Moody's had previously assigned Yukos a primary rating of Ba1 and a primary unsecured rating of Ba2. These ratings were marked as stable.
Until now, Sibneft had a Ba2 rating and a corporate unsecured debt rating of Ba3 - both ratings were given a positive forecast.
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