'I think it's too early to judge,' Tillerson said during a visit to Egypt. 'As we've said for some time, it's really up to the North Koreans to decide when they're ready to engage with us in a sincere way, a meaningful way. They know what has to be on the table for conversations.'
Tillerson spoke at a joint news conference with Egyptian Foreign Minister Sameh Shoukry after the two diplomats discussed regional security issues such as Libya and Syria, as well as the Israeli-Palestinian peace process.
Tillerson said the Egyptian people should be confident in the continuing U.S. commitment to supporting Egypt in fighting terrorism.
'Our joint commitment to defeat ISIS is steadfast and there has been no gap between Egypt and the United States in our joint efforts to confront terrorists and extremism in the region, but most specifically here in Egypt as well,' he said, using an acronym for the Islamic State group.
Tillerson is due to meet with Egyptian President Abdel Fattah el-Sissi on the first stop of his five-country Middle East trip. He is also visiting Jordan, Turkey, Lebanon, and Kuwait.
Sissi is widely expected to win re-election next month after most candidates believed to represent a serious challenge have dropped out of the race, including several who were arrested or faced pressure to withdraw.
When asked questions about how fair the vote will be, Tillerson said the United States has always supported free and fair elections in any country, including Egypt.
'So the U.S. is always going to advocate for an electoral process that respects the rights of its citizens to make the choices the citizens want to make and the full participation of citizens in those elections,' he said.
This undated image released Jan. 24, 2018 on the official Facebook account of Egyptian President Abdel-Fattah el-Sissi, shows workers carrying boxes that bear the president's image and the phrase "long live Egypt!" in Cairo, Egypt.
Shoukry said certain human rights groups that criticized the electoral climate in Egypt lacked information and 'direct association' with Egyptian society.
'It is the Egyptian people who should determine how they are applying their freedoms and their political activism,' Shoukry said.
In Ankara, Tillerson will press Turkey to release Americans detained by Ankara, and urge the NATO ally to show restraint in military operations in northern Syria, according to senior U.S. officials.
'At times like this, engagement is all the more important,' said a State Department official Friday, while acknowledging, 'It's going to be a difficult conversation.'
The top U.S. diplomat's visit to Ankara comes amid escalated tensions over a series of disagreements, including human rights cases and the Syria crisis.
'Look, it's difficult. The rhetoric is hot, the Turks are angry and this is a difficult time to do business, but it's our belief that there are still some very fundamental underlying shared interests,' the senior official said Friday.
The State Department says U.S. citizen Serkan Golge, a NASA scientist who was arrested in July 2016, was convicted 'without credible evidence' on February 8 by Turkish authorities for being a member of a terror organization.
FILE - Human rights activists stage a protest demanding the release of Amnesty International';s Taner Kilic, outside a court in Istanbul, Turkey, Jan. 31, 2018.
On February 1, Amnesty International's Turkey chairman, Taner Kilic, was re-arrested and placed back in pretrial detention. Kilic is facing terrorism charges.
The State Department said it is deeply troubled by those cases and urged the Turkish government to 'end the protracted state of emergency, to release those detained arbitrarily under emergency authorities, and to safeguard the rule of law consistent with Turkey's own domestic and international obligations and commitments.'
In the year after a failed coup in July 2016, Turkey arrested more than 50,000 people and fired 150,000, including many from the police, army and judiciary.
Turkish President Recep Tayyip Erdogan accused Fethullah Gulen, an exiled cleric based in the United States, of orchestrating the attempted coup. Gulen has denied any role in the plot. Ankara has also asked Washington to extradite Gulen.
The lack of trust between Washington and Ankara grew after Turkey started an air and ground offensive in Afrin, Syria, against a Kurdish group known as the People's Protection Units, or YPG. Turkey considers the YPG to be a terrorist organization, alleging it is an extension of a Kurdish group fighting for autonomy in Turkey for decades.
Turkish artillery fires toward Syrian Kurdish positions in Afrin area, Syria, from Turkish side of the border in Hatay, Turkey, Feb. 9, 2018.
The United States denies those connections and sees the YPG as a key ally in the battle against Islamic State militants.
'We are urging them [Turkish authorities] to show restraint in their operations in Afrin, and to show restraint further along the line across the border in northern Syria,' said a senior State Department official.
'We can work with them to address their legitimate security concerns while, at the same time, minimizing civilian casualties and above all else, keeping everything focused on the defeat ISIS fight, which is not over,' he added, using the acronym of the Islamic State militants.
Other stops on schedule
In Amman, Tillerson will meet with the Jordanian leadership on the conclusion of a new memorandum of understanding on bilateral assistance, and discuss key regional issues, such as the ongoing crisis in Syria and Jordan's support for Middle East peace.
In Beirut, he will meet with Lebanese President Michel Aoun, Prime Minister Saad Hariri, and Speaker of Parliament Nabih Berri to emphasize U.S. support for the Lebanese people and the Lebanese armed forces.
The chief U.S. diplomat will also lead a delegation to the ministerial meeting in Kuwait of the 74-member Global Coalition to Defeat ISIS. He will also participate in the Iraq Reconstruction Conference, which is the first since Islamic State was defeated in Raqqa, Syria and Iraq declared some of its own territory liberated.
The three-day Iraq Reconstruction Conference will showcase private sector investment opportunities and international support for Iraq.