In this June 12, 2018 photo, US President Donald Trump, right, meets with leader of the Democratic People’s Republic of Korea (DPRK) Kim Jong-un at the Capella Hotel on Sentosa Island in Singapore. (EVAN VUCCI / AP)

ABOARD AIR FORCE ONE — US President Donald Trump said on Saturday he is likely to meet leader of the Democratic People’s Republic of Korea (DPRK) Kim Jong-un in January or February and that three sites for their second meeting are under consideration. 

We're getting along very well. We have a good relationship. 

Donald Trump, US President

"We're getting along very well. We have a good relationship," Trump told reporters aboard Air Force One on his return from a G20 summit in Argentina. 

Trump added that at some point he will invite Kim to the United States. 

The two sides have been engaged in talks on the leaders' second meeting after the first, unprecedented, one in Singapore in June, Reuters reported in October, citing a senior official. 

The White House said in a statement on Saturday after Trump's meeting with Chinese President Xi Jinping that they and Kim will strive "to see a nuclear free Korean Peninsula." 

The statement said Xi and Trump "agreed that great progress has been made with respect to North Korea." 

The DPRK is also referred to as North Korea.

READ MORE: Trump hints at second meeting with DPRK's Kim

Last month, Vice-President Mike Pence said Trump would push for a concrete plan outlining Pyongyang's moves to end its arms programs. 

Pence told NBC News last month the United States would not require Pyongyang to provide a complete list of nuclear weapons and locations before the second summit, but that the meeting must produce a concrete plan. 

"I think it will be absolutely imperative in this next summit that we come away with a plan for identifying all of the weapons in question, identifying all the development sites, allowing for inspections of the sites and the plan for dismantling nuclear weapons," Pence said. 

Pence said last month it was essential that international sanctions pressure be maintained on the DPRK until its complete denuclearization was achieved. 

The DPRK had been angered by Washington's refusal to ease sanctions and has warned it could resume development of its nuclear program if the US did not drop its campaign.