North Korean leader Kim Jong Un said he would focus on expanding his country’s nuclear arsenal and that prospects for improving relations with the US rested entirely on Washington’s attitude, state media KCNA reported on Thursday.North Korea’s week-long Ninth Congress of the ruling Workers’ Party wrapped up with a military parade in the capital Pyongyang on Wednesday, KCNA reported.For all the latest headlines, follow our Google News channel online or via the app.The Asian nation’s “international status has risen extraordinarily” as it laid out major policy goals for the next five years, Kim said.“It is our party’s firm will to further expand and strengthen our national nuclear power, and thoroughly exercise our status as a nuclear state,” Kim said, according to KCNA. “We will focus on projects to increase the number of nuclear weapons and expand nuclear operational means.”North Korea has assembled around 50 warheads, possesses enough fissile material to produce up to 40 more and is