Head of International Campaign to Abolish Nuclear Weapons says Russian president's warning are meant to instill fear in the whole world and deter anyone from helping in Ukraine

Accords opposed by 9 countries known or believed to possess nuclear weapons — US, Russia, Britain, China, France, India, Pakistan, North Korea and Israel — as well as NATO

Amid talks over inclusion of China in new deal, US negotiator says 'we do remain far apart on a number of key issues'