US President Donald Trump said on Thursday he had walked away from a nuclear deal at a summit with North Korean leader Kim Jong Un because of unacceptable North Korean demands to lift punishing US-led sanctions. Earlier, both Trump and Kim had expressed hope for progress on improving relations and on the key issue of denuclearization, in their talks in the Vietnamese capital, Hanoi, their second summit in eight months. “It was all about the sanctions,” Trump said at a news conference after the talks were cut short. “Basically they wanted the sanctions lifted in their entirety, and we couldn’t do that.” The United Nations and the United States ratcheted up sanctions on North Korea when the reclusive state undertook a series of nuclear and ballistic missile tests in 2017, cutting off its main sources hard cash. Both Trump and Kim left the venue of their talks, the French-colonial-era Metropole hotel, without attending a planned lunch together, and returned to their hotels. “Sometimes you have to walk, and this was just one of those times,” Trump said, adding “it was a friendly walk”.