Venezuela braces for aid deadline amid rival concerts on border Video

Now Playing: Venezuela tension continues as major showdown set for this weekend

Now Playing: Crisis in Venezuela

Now Playing: Protests in Venezuela

Now Playing: Stunning scene as starlings fly in Somerset sky

Now Playing: US sends aid to help Venezuelans

Now Playing: 2nd day of the Vatican’s historic summit

Now Playing: Venezuela braces for aid deadline amid rival concerts on border

Now Playing: Civilians escape last ISIS-held pockets in Syria

Now Playing: Catholic church abuse summit underway at the Vatican

Now Playing: Gorilla baby, snowman in Vegas and a Trump mask: World in Photos, Feb. 22

Now Playing: US bomber crew honored at flypast in England

Now Playing: Pres. Trump and Kim Jong Un impersonators arrive in Hanoi

Now Playing: Tension on the Venezuela border

Now Playing: Across the Pond: Breakdancing in the Olympics?

Now Playing: 7.5 magnitude earthquake strikes eastern Ecuador

Now Playing: American detained in Russia speaks to reporters in court

Now Playing: Historic summit held at the Vatican by the pope

Now Playing: ‘Extinct’ Galapagos tortoise found after 113 years

Now Playing: Pope, bishops address sexual abuse crisis at summit