Now Playing: US teen jailed in Caribbean for breaking COVID rules speaks out for the first time

Now Playing: ABC News Live Prime: Monday, January 18, 2021

Now Playing: The Rundown: Top headlines today: Jan. 18, 2021

Now Playing: Yemen on the brink of starvation

Now Playing: Russian opposition leader detained upon return to country

Now Playing: Washington, D.C., COVID-19, and migrants: World in Photos, Jan. 18

Now Playing: Palace of Versailles blanketed with snow

Now Playing: Massive migrant caravan heads to US

Now Playing: Alexei Navalny detained after landing in Moscow

Now Playing: Migrant caravan clashes with Guatemalan authorities

Now Playing: Aerial footage shows snow-covered Switzerland

Now Playing: Alexey Navalny detained on his return to Russia

Now Playing: Search for survivors underway after deadly earthquake

Now Playing: Polar bears play in snow

Now Playing: CDC warns UK variant could become predominant COVID variant in US by March

Now Playing: COVID-19 vaccine access proves difficult in multiple states

Now Playing: Israel’s speedy vaccine rollout creates divide

Now Playing: COVID-19, Malanka celebrations, President Trump impeachment: Week in Photos

Now Playing: Mother bear and cub explore Machu Picchu

Now Playing: Catcher calmly pulls snake from vent