Washington on Monday accused China of dramatically expanding its nuclear arsenal. Reiterating claims that Beijing conducted secret nuclear tests, Washington stated that China must be part of any future arms control treaty.Washington stated earlier this month that the implementation of the 'New START' treaty between the US and Russia presented the possibility for the world to achieve a 'better agreement' that includes Beijing.China has publicly rejected calls to enter negotiations for a new tripartite treaty.Christopher Yeou, US Assistant Secretary of State for Arms Control and Disarmament, told the Conference on Disarmament in Geneva that 'New START' was seriously flawed and...