A top aide to North Korean leader Kim Jong Un arrived in Singapore Monday evening to meet with U.S. government officials, an indication that the fragile June 12 summit with President Donald Trump will proceed, Reuters reported.

President Trump had abruptly called off the highly anticipated summit with Kim before retracting a day later.

Kim Jong Un’s chief of staff, Kim Chang Son, arrived in Singapore by way of Beijing, where he told reporters he was “going to play” in Singapore.

Meanwhile, U.S. government officials, flew to Singapore from U.S. Yokota Air Base in Japan, to work out the details of the June 12 summit.

Monday night’s pre-advance meeting follows a surprise second meeting between Kim Jon Ung and South Korean President Moon Jae-in on Saturday and a meeting between North Korean officials and the U.S. State Department on Sunday. Both meetings were held at the border village of Panmunjom.

The two Korean leaders had previously met in Panmunjom on April 27, to discuss denuclearization and a formal end to the Korean War – which technically hasn’t ended since 1953.

According to reports, Moon and Kim agreed on Saturday that the summit with Trump must proceed.

Trump has repeatedly demanded that North Korea completely abandon its nuclear weapons in exchange for lifting sanctions.

North Korea has said it will not give up its nuclear program until the United States withdraws its 28,500 troops stationed in South Korea and end its decades-long alliance with Seoul.