Children of Deep-Cover Russian Spies Discover Their True Identities During Prisoner Swap

Siblings Sofia and Daniel, raised in Argentina and Slovenia, learn they are Russian on a flight to Moscow after their parents' arrest.

The children were unaware of their parents' true identities until the flight to Moscow.
Their parents, Maria Mayer and Ludwig Gisch, were actually Russian spies Anna and Artem Dultsev.
The family was part of the largest Russia-US prisoner exchange since the Cold War.
The children, who spoke no Russian, faced a bewildering new reality upon arrival in Moscow.
The case highlights the personal sacrifices and complex lives of deep-cover operatives.