“South Korea said on Tuesday an agreement with the United States to scrap a weight limit on its warheads would help it respond to North Korea’s nuclear and missile threat after it conducted its sixth and largest nuclear test two days ago. South Korea’s Asia Business Daily, citing an unidentified source, reported that North Korea had been observed moving a rocket that appeared to be an intercontinental ballistic missile (ICBM) towards its west coast. The rocket started moving on Monday and was spotted moving only at night to avoid surveillance, the newspaper said.”
Source: South Korea seeks bigger warheads, North Korean ICBM reportedly on the move