BEIJING, May 26 (Xinhua) -- China voiced opposition against weaponization of and arms race in outer space in its latest military white paper here Tuesday.

Outer space is highlighted as one of China's four "critical security domains", other than the ocean, cyberspace and nuclear force, by the report titled "China's Military Strategy", published by the State Council Information Office.

Countries concerned are developing their space forces and instruments, and the first signs of weaponization of outer space have appeared, the report warns.

The report stresses that China has all along advocated the peaceful use of outer space and taken an active part in international space cooperation.

The country will keep abreast of the dynamics of outer space, deal with security threats and challenges in that domain, and secure its space assets to serve its national economic and social development, and maintain outer space security.