The head of Russia's space agency has blamed the Luna-25 spacecraft crashing into the moon on the country's decades-long pause in lunar exploration. The unmanned robot lander had been scheduled to become the first spacecraft to touch down on the south pole of the moon on Monday, in an area where scientists believe important reserves of frozen water and precious elements may exist. Roscosmos director general Yury Borisov said the spacecraft's engines were turned on over the weekend to put Luna-25 into a "pre-landing orbit" but did not shut down properly – slamming the lander onto the moon. "Instead of…