Pakistan and India since their independence involved in never-ending arms race despite the fact the Pakistan cannot compete with Indian conventional weapon capability but in order to compete with them, they developed a nuclear and tactical weapon. India already has a second strike capability it’s the ability of the state to strike back at the enemy through sea-based nuclear weapons as their backup.
The Democratic People’s Republic of Korea (DPRK, North Korea) conducted its sixth nuclear test on 3 September 2017. Preliminary estimates of yield are in the range of 100 to 150 kilotons (kt), although this figure will be subject to revision over a period of weeks. In the end, the degree of uncertainty is likely to be tens of kilotons.
In realist paradigm of International relations, one shall not solely trust the words of another state when it is a matter of a threat to national security. States can abrogate even a mutual pact when it is conflicting with their national interests. For instance, in December 1940, several sources warned Stalin about the imminent threat of a Nazi invasion, but he remained oblivious and assumed that Hitler would abide by the Molotov-Ribbentrop pact.
America conducted world’s first nuclear attack (Atomic test on humans) in Hiroshima of Japan seventy two years ago, while America constantly giving contradictory statements of never using nuclear arsenal again.