Explanation

NPT stands for Non-Proliferation Treaty

NPT signed: 1968

Not a member of the NPT:

1. India,
2. Israel,
3. North Korea,
4. Pakistan 
5.  South Sudan 

Members of the five NPT nuclear-weapon states:

1. China
2. France
3. Russia
4. the United Kingdom

Languages:

1. English
2. Russian
3. French
4. Spanish
5. Chinese