With no explanation, label text_A→text_B with either "DON'T KNOW", "NO" or "YES".
text_A: The end of the long-held animosity between Moscow and Beijing was marked by the visit to China by Soviet General Secretary Mikhail Gorbachev in 1989. After the 1991 demise of the Soviet Union, China's relations with Russia and the former states of the Soviet Union became more amicable as the conflicting ideologies of the two vast nations no longer stood in the way. A new round of bilateral agreements was signed during reciprocal head of state visits. As in the early 1950s with the Soviet Union, Russia has again become an important source of military technology for China, as well as for raw materials and trade. Friendly relations with Russia have been an important advantage for China, offsetting its complicated and sometimes combative relations with the U.S.
text_B: Are China and Russia able to easily cooperate on most issues?
YES.