He also said that Pyongyang knows "what has to be on the table for conversations".
Speaking at a meeting of his counterparts in Kuwait City, Tillerson representatives from more than 70 nations that the coalition will not stop, "until we have achieved the full and enduring defeat of ISIS (Islamic State)".
Tillerson noted that discussions included "the promotion and protection of human rights and the vital role of civil society in Egypt" and the upcoming Egyptian presidential election in March, in which incumbent President Abdel Fattah el-Sissi is running largely unopposed.
Tillerson also said Washington had made a decision to provide $200 million of aid to stabilize liberated areas in Syria and that the United State will continue training local forces in the war-torn country.
The Trump administration, concerned that the coalition it cobbled together to destroy the Islamic State group is losing sight of the prime objective, pressed its partners on Tuesday to refocus their efforts.
"We don't bypass ISIS", Mattis said.
Mom wakes up with British accent. She's never left the US
Three times in the past seven years, Myers has gone to sleep with blinding headaches only to wake up with a different accent. Looking back at how she used to be is hard , Myers says. "I'm sad", she said, watching an old video of her speaking normally.
But the U.S. acting assistant secretary of state, David Satterfield, said on Wednesday that the fallout had been limited.
Rex Tillerson arrived less than 24 hours after Israel carried out a wave of airstrikes in Syria, after intercepting an Iranian drone that had infiltrated its airspace and an Israeli F-16 was downed upon its return from Syria.
Both Tillerson and al-Safadi acknowledged the disagreements but said the end goal of both countries remains the same.
Although the US government was not expected to pledge direct financial aid at the conference, Tillerson said the official USA export credit agency, the Export-Import Bank of the United States (EXIM), would sign with Iraq's finance ministry on Tuesday a $3 billion memorandum of understanding "that will set a stage for future cooperation".
Baghdad announced on the first day of the conference that it needs $88.2 billion, including $20 billion in the short term and the rest in the medium term.
Iraq's prime minister declared victory over the militant group late previous year. Just about every country represented has companies that are owed money by the Iraqi government.
Nizar Nasser Hussein, head of the legal department at the National Investment Commission, said the latest version of the law does not distinguish between foreign and Iraqi investors.