U.S. officials and military specialists say it is difficult to pin down the level of collaboration between two nations that tightly control information, and whose actions are increasingly opaque to outsiders. But Western officials and defense experts are growing more convinced of the closer relationship based on recent economic alliances, military exercises and joint defense development, as well as the few public statements from government leaders.
See also:
–Angst Over China, Russia Lessens Chance Of US Nuke Changes
–China And Russia Team Up To Establish Joint Moon Base