Photos: Hanging Out in Hanoi With Trump and Kim

The second Trump-Kim summit seemed to be going so well. Then just like that, it was over.

U.S. President Donald Trump and North Korean leader Kim Jong Un started proceedings with a warm handshake just like the one seen in Singapore last year, and soon got down to business. But on Thursday afternoon the leaders' working lunch was abruptly cancelled and talks collapsed without an agreement, plunging future negotiations on North Korea’s nuclear program into question.

"Sometimes you have to walk," Trump later told reporters.