WASHINGTON, Feb. 2 (Xinhua) -- The U.S. Defense Ministry on Friday officially published the 2018 Nuclear Posture Review, the guiding principle for the future U.S. policy about its nuclear arsenal which is already the world's largest.

"The United States now faces a more diverse and advanced nuclear-threat environment than ever before, with considerable dynamism in potential adversaries' development and deployment programs for nuclear weapons and delivery systems," the document claimed.

The comprehensive report, which is largely in line with the 2010 review done by the Obama administration, reaffirms commitments to non-proliferation treaties but emphasizes the need to enhance capabilities to match with Russia, showing supports for the united states' nuclear modernization projects.