Secretary of State Rex Tillerson Rex Wayne TillersonGary Cohn: 'I haven't made up my mind' on vote for president in November Kushner says 'Alice in Wonderland' describes Trump presidency: Woodward book Conspicuous by their absence from the Republican Convention MORE reiterated his stance Tuesday that diplomacy with North Korea is possible, telling a group of world leaders that he would continue pursuing diplomatic solutions "until the first bomb drops."

Speaking at the Atlantic Council Korea Foundation Forum, Tillerson said that he would continue to search for diplomatic solutions with Pyongyang but stressed that Defense Secretary James Mattis James Norman MattisBiden courts veterans amid fallout from Trump military controversies Trump says he wanted to take out Syria's Assad but Mattis opposed it Gary Cohn: 'I haven't made up my mind' on vote for president in November MORE is prepared should war break out.

"We need the DPRK to come to the table for talks," Tillerson said, using the acronym for the country's formal name, the Democratic People's Republic of Korea. "We're ready to talk any time they'd like to talk."

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"As I've told people many times, I will continue our diplomatic efforts until the first bomb drops," he added. "I'm confident that we're gonna be successful. But I'm also confident that Secretary Mattis will be successful if it ends up being his turn."

Tillerson told the assembled officials from South Korea and the U.S. that the Trump administration had directed a "full range" of military assets to be ready in the region should violence break out.

"In the meantime, our military preparedness is strong," Tillerson said. "Because of the situation, the president has ordered our military planners to have a full range of contingencies available, and they are ready."

North Korea has conducted a series of ballistic missile tests in recent months, including one in late November that the country claimed put the entire U.S. mainland in range.

"It went higher, frankly, than any previous shot they've taken," Mattis said at the time. "The bottom line is it is a continued effort to build a ballistic missile threat that endangers world peace, regional peace and certainly the United States."