The Trump administration plans to loosen constraints on the use of nuclear weapons and develop a new low-yield nuclear warhead for US Trident missiles, according to a former official who has seen the most recent draft of a policy review. Jon Wolfsthal, who was special assistant to Barack Obama on arms control and nonproliferation, said the new nuclear posture review prepared by the Pentagon, envisages a modified version of the Trident D5 submarine-launched missiles with only part of its normal warhead, with the intention of deterring Russia from using tactical warheads in a conflict in Eastern Europe. The new nuclear policy is significantly more hawkish that the posture adopted by the Obama administration, which sought to reduce the role of nuclear weapons in US defence.(theguardian)…[+]