What is the fine-grained topic of the following text: Foreign ministers and high-level representatives from the 183 Member States of the Treaty have urged the eight remaining States – China, the Democratic People’s Republic of Korea (DPRK), Egypt, India, Iran, Israel, Pakistan and the United States – to sign and ratify the CTBT, “thus ridding the world once and for all of nuclear test explosions”. Only return the topic.
Urging remaining states to sign and ratify the CTBT for nuclear test ban