Russian President Dmitry Medvedev has positively appraised Tuesday's talks with Armenian President Serzh Sargsian, Itar-Tass reported. “We have discussed prospects of bilateral business and humanitarian relations, and exchanged opinions on key issues of the regional and international life,” Medvedev told a news conference. The two countries' cooperation is actively developing. Bilateral trade is approaching one billion dollars. Medvedev said Russia is a main investor in the Armenian economy. Its investment has been 1.2 billion dollars.