In this era of globalization, the world is facing a host of challenging security problems -from the proliferation of weapons of mass destruction to international terrorism to accelerating climate change to energy security -that cannot be resolved unilaterally, especially through the unilateral use of military force. One key issue that requires urgent global attention is literally ""out of this world"": the military use of outer space. This collection of essays by leading Russian experts analyzes the current military use of outer space.