Russia and China have agreed to build a base on or around the Moon, the latest signal of geopolitical maneuvering in space and an apparent rebuke of the United States.Roscosmos, the Russian space agency, signed an agreement this week with the Chinese National Space Administration on the joint creation of what they call the International Scientific Lunar Station.The memorandum of understanding between the two governments is the latest sign that Russia sees its future in space as primarily a cooperative effort with the Chinese space program rather than with NASA, its main partner of the last 25 years.