SEOUL — North Korea promised to close its atomic test site next month and invite US weapons experts to the country, Seoul said on Sunday, as Donald Trump expressed optimism about securing a nuclear deal in his summit with the secretive regime. The reported pledge from the North’s leader Kim Jong Un follows weeks of whirlwind diplomacy that saw Kim and South Korean President Moon Jae-in agree to pursue the complete denuclearization of the peninsula during a historic summit on Friday. “Kim said, during the summit with President Moon, that he would carry out the closing of the nuclear test site in May,” Seoul’s presidential spokesman Yoon Young-chan said. Kim said he “would soon invite experts of South Korea and the US as well as journalists to disclose the process to the international community with transparency”, Yoon added. Tensions spiked last year over the North’s testing of atomic weapons and long-range missiles, including some capable of reaching the US mainland. “Kim said ‘the US feels repelled by us, but once we talk, they will realize that I am not a person who will fire a nuclear weapon to the South or the US or target the US,” according to Yoon. “If we meet often (with the US), build trust, end the war and eventually are promised no invasion, why would we live with the nuclear weapons?’“ Kim also slammed speculation that the North’s Punggye-ri nuclear test site was already unusable after an underground tunnel there reportedly collapsed. “As they will see once they visit, there are two more tunnels (at the test site) that are even bigger... and they are in good condition,” he was quoted as saying. The remarks are likely to be seen as a sweetener ahead of Trump’s own planned summit with Kim, which the US president said would take place “in the next three or four weeks”. Trump touted his ability to achieve a nuclear deal with the regime at a campaign- >