On June 12, 2018, Kim met American President Donald Trump at a summit in Singapore and signed a declaration, again affirming a commitment to peace and denuclearization. Trump announced that he would halt military exercises with South Korea and foreshadowed withdrawing American troops entirely. In September, South Korean President Moon visited Pyongyang for a summit with Kim. In February 2019 in Hanoi, a second summit between Kim and Trump broke down without an agreement. On June 30, 2019, Trump, Moon, and Kim met at the DMZ. Talks in Stockholm began in October between US and North Korean negotiating teams, but broke down after one day.Starting in January 2020, the North Korean government took extensive measures to block the spread of the COVID-19 pandemic, including quarantines and travel restrictions. In April, the US analyst website 38 North said this appeared to have been successful.