The two leaders signed a statement calling for comprehensively deepening______.

President Hu Jintao and Russian President Dmitry Medvedev inspected an honor guard at a welcoming ceremony Monday at Beijing’s Great Hall of the People.
    Following a closed-door meeting, the two leaders signed a statement calling for comprehensively deepening what was described as "the strategic partnership of cooperation".
    The two giant neighbors also signed agreements to fight separatism and extremism, and commercial deals covering coal, nuclear energy and banking.
    The Chinese president pointed to a series of agreements to expand trade and economic cooperation. He especially praised the completion of the first oil pipeline from Russia to China.
    Mr. Hu points out the pipeline, and says both sides agree to stick to the principles of openness and mutual benefit in further cooperation in trade, investment, energy, finance, legislation and high-technology industries.