In a chapter from the Cold War, the U.S. and Russia are both reportedly developing anti-satellite systems. Last fall, Russia tested what's believed to be the beginnings of a killer satellite. The Pentagon also admitted, in a 2014 report, that it was investing in offensive space weapons.
China too might be developing anti-satellite systems. In 2013, it launched what it called a scientific mission, but what experts say was a test of the Dong Ning-2, a surface missile that could strike enemy targets in low-Earth, high-Earth, and geostationary orbits.
After launching the Tiangong 3 space station sometime after 2020, China will become the only country with its own multimodule craft in space. China has said that the Tiangong 3 (which means "Heavenly Palace") is for scientific research, but to military planners, it will be an enviable asset—especially as the International Space Station readies for decommission sometime in the mid-2020s.