Both journalists and other prisoners were freed following complex negotiations with the Russian government.

The four prisoners were part of the largest prisoner swap since the Cold War.

Kurmasheva has yet to be declared “wrongfully detained” by the Department of State.

Kurmasheva was detained by Russian authorities last year on charges that she'd failed to register as a foreign agent.

Kurmasheva was detained by the Russians last October on charges that she'd failed to register as a foreign agent.

Kurmasheva stands accused of violating a law on "foreign agents.”