U.S. President Donald Trump has said that North Korea had a bright economic future if the two countries made a deal, but did not have any economic future with nuclear weapons.

The second meeting between Trump and North Korean leader Kim Jong un, in Vietnam, was cut short after they failed to reach a deal on the extent of sanctions relief North Korea would get in exchange for steps to give up its nuclear program.

Donald Trump said that the relationship with North Korea seemed to be “very, very strong.”

The United States and North Korea have said they intend to continue talks, but have not said when a next round might take place.