He joined the FBI in 1979 and In 2001, Robert Hanssen was sentenced to 15 consecutive life sentences in federal prison (without parole; there’s no parole in the federal prison system). He’s currently “living” the rest of his days in at ADD Florence, a supermax prison near Florence, Colorado. ADX Florence is basically Arkham Asylum. Built for supervillains.
This is key. While he was useful to the USSR, it looks like he would've done the same had he been born on the opposite side. Very critical support.