Release of Brittney Griner sparks debate over former US Marine still detained in Russia

US basketball player Brittney Griner was released from a penal colony near Moscow in a prisoner swap with Russia, US and Russian officials said Thursday. Griner was freed in exchange for notorious Russian arms dealer Viktor Bout.
Griner's release has, however, fueled debate about the fate of American Paul Whelan, a former US Marine officer who is currently serving a 16-year sentence in Russia for espionage. US officials say he is "wrongfully detained" and call the case politically motivated.
DW talked to David Whelan about the situation his brother has found himself in.