The deal that secured their freedom was a feat of diplomacy, Biden wrote in a statement.

Our alliances make Americans safer, Biden added.

The successful swap was not without its tragedy.

Left: Evan Gershkovich. Right: Paul Whelan.

Left: Evan Gershkovich. Right: Paul Whelan.NATALIA KOLESNIKOVA/AFP/Getty Images; Kirill KUDRYAVTSEV/AFP/Getty Images

Navalnydied under incredibly suspicious circumstancesin February while serving a 19-year sentence on controversial, extremism-related charges.

Navalnys family and several governments have accused the Russian government of murdering the long-time critic of Vladimir Putin.

Why didnt he do it when he was president?