China accuses US of 'Cold War mentality' over nuclear policy

China has urged the US to drop its "Cold War mentality" after Washington said it planned to diversify its nuclear armoury with smaller bombs.
"The country that owns the world's largest nuclear arsenal, should take the initiative to follow the trend instead of going against it," China's defence ministry said on Sunday.
The US military believes its nukes are seen as too big to be used and wants to develop low-yield bombs.
Russia has already condemned the plan.
Iran's foreign minister claimed it brought the world "closer to annihilation".
What is the new US policy?
The US is concerned about its nuclear arsenal becoming obsolete and no longer an effective deterrent. It names China, Russia, North Korea and Iran as potential threats.
Where are the world's nuclear weapons?
The Pentagon document released on Friday, known as the Nuclear Posture Review (NPR), argues that developing smaller nuclear weapons would challenge that assumption. Low-yield weapons with a strength of under 20 kilotons are less powerful but are still devastating. The policy also proposes:
Land-based ballistic missiles, submarine-launched missiles, and air-delivered weapons - to be extensively modernised, as begun under ex-President Obama
Proposed modification of some submarine-launched nuclear warheads to give a lower-yield or less powerful detonation
Return of sea-based nuclear cruise missiles