Chinese President Xi Jinping on Wednesday told former Russian President Dmitry Medvedev that relevant parties to the Ukraine crisis should remain rational and exercise restraint, engage in comprehensive dialogue and address common security concerns through political means, state-run media said.China "upholds objectivity and fairness" and actively promotes peace talks, Xi told Medvedev, currently deputy chairman of Russia's Security Council, during their meeting in Beijing, according to the official Xinhua News Agency.Medvedev, who was invited by China's ruling Communist Party as leader of the ruling United Russia party, said there are reasons for the Ukraine crisis and it is very complicated, adding Russia is willing to solve the problems through peace talks, Xinhua said.Since Russia invaded its neighbor in February, Beijing has refrained from condemning Moscow and has opposed sanctions levied against it by Western nations.Xi noted that China-Russia relations have withstood the test of global changes over the past decade and maintained a sound, steady, high-level development."