A couple of Russian spies living in Slovenia posing as Argentinians were included in Thursday’s massive prisoner exchange, though they were so deep undercover that their own two children were unaware of their true identity.

The family of four, the Dultsevs, were among eight Russians who were sent back to their home countries from the United States, Slovenia, Germany, and Norway, in exchange for the release of three Americans, an American green card holder, five Germans, including one from Belarus, and seven Russian political dissidents.