Moody`s Investors Service has confirmed several key credit ratings of Ukraine, concluding a review for possible upgrade that began in March, and has maintained a positive outlook on these same ratings, according to a Moody`s press-release, forwarded to UNIAN. The decision not to upgrade the ratings that were under review but rather to keep a positive outlook takes into account an upcoming period of political and economic uncertainty, set against the much-improved sustainability of the government`s debt metrics and relatively consistent fiscal policy.