What is the fine-grained topic of the following text: MOSCOW, Feb 12 (PRIME) -- International rating agency Standard & Poor's Global Ratings (S&P) has improved the outlook on the rating of Russian real estate developer Pioneer Group to Positive from Stable and affirmed the company’s long-term credit rating at B-, the company said in a statement on Monday. Only return the topic.
Standard & Poor's upgrade of Pioneer Group's outlook to positive from stable.