A direct flight from Pyongyang touched down in Singapore on Saturday, fueling speculation that a North Korean delegation is joining an advance team in the city-state ahead of talks between leader Kim Jong Un and President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE.

Reuters reported the arrival of an Air China Airbus 330 in Singapore. Direct flights between the two countries are rare.

Kim Chang Son, a close aide to Kim Jong Un, is already in Singapore to prepare for the highly anticipated summit scheduled for Tuesday. According to Reuters, Kim Jong Un is expected to arrive in Singapore on Sunday.

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Trump departed a Group of Seven summit in Canada ahead of schedule Saturday morning to head for Singapore.

The planned sit-down between Trump and Kim will mark the first meeting between a sitting U.S. president and a North Korean leader in history.

Trump previewed his meeting with Kim at a news conference Saturday morning, saying he would know within the "first minute" of meeting Kim whether the North Korea leader was serious about abandoning his nuclear program.