Who wants what at the second Trump-Kim Summit? SCMP journalists in Hanoi explain

US President Donald Trump will meet North Korean leader Kim Jong-un for a second face-to-face meeting at the end of February. The summit is being hosted in the Vietnamese capital Hanoi eight months after the leaders first held talks in Singapore. Each side has its own agenda, and other countries in the region are also watching closely. But who wants what out of this meeting? South China Morning Post journalists John Power, Lee Jeong-ho and Bhavan Jaipragas explain.