As Vietnam's capital gears up for the second summit between US President Donald Trump and North Korean leader Kim Jong Un, people take time to relax at nighttime by Hoan Kiem Lake in downtown Hanoi. In this Saturday, Feb. 23, 2019, photo, a vendor sells balloons near Hoan Kiem Lake in Hanoi, Vietnam. (Photos: AP)

In this Saturday, Feb. 23, 2019, photo, a girl poses for a photo with a big balloon near Hoan Kiem Lake in Hanoi, Vietnam.

In this Saturday, Feb. 23, 2019, photo, two girls look at their smartphone after taking a selfie at Hoan Kiem Lake in Hanoi, Vietnam.

In this Saturday, Feb. 23, 2019, photo, a vendor sells chicken and noodles near Hoan Kiem Lake in Hanoi, Vietnam.

In this Saturday, Feb. 23, 2019, photo, a vendor sells fruits near Hoan Kiem Lake in Hanoi, Vietnam.

In this Saturday, Feb. 23, 2019, photo, a woman holds a balloon near Hoan Kiem Lake in Hanoi, Vietnam.

In this Saturday, Feb. 23, 2019, photo, vendor sell crab near Hoan Kiem Lake in Hanoi, Vietnam.

In this Saturday, Feb. 23, 2019, photo, women buy fruits at a booth near Hoan Kiem Lake in Hanoi, Vietnam.

In this Saturday, Feb. 23, 2019, photo, a girl poses a photo at a new year decoration near Hoan Kiem Lake in Hanoi, Vietnam.

In this Saturday, Feb. 23, 2019, photo, a vendor waits for customers at a coffee beans shop near Hoan Kiem Lake in Hanoi, Vietnam.