Original sentence: North Korea showed an interest in developing nuclear weapons since the 1950s
Edited sentence: A conciliatory gesture by the US is followed by a conciliatory gesture by North Korea.In 1950 during the Korean War, US nuclear threats against China may have contributed to the stalemate and, three years later, the cease file that was extended indefinitely.Noam Chomsky said that the history of US relations with North Korea, especially regarding nuclear weapons, is an example matching the famous tit for tat construct in mathematical game theory:  A hostile gesture by the US is followed by a hostile gesture from North Korea.North Korea has shown an interest in obtaining nuclear weapons since