But Moscow's offensive in Ukraine is a sensitive issue for Beijing, which has sought to position itself as neutral but has offered diplomatic backing to its strategic ally Russia."We aim to strengthen cooperation between the armed forces of Russia and China," Putin told Xi by video link at the start of the talks, calling the Chinese leader a "dear friend".The Kremlin chief also hailed the efforts of Moscow and Beijing to counter "unprecedented Western pressure and provocations"."We are ready to ramp up strategic cooperation with Russia, give each other opportunities to develop, be global partners for the benefit of the peoples of our countries and in the interests of stability in the world," Xi said."China is ready to work with Russia and all progressive forces around the world to oppose unilateralism, protectionism and bullying," the broadcaster said."