defection russian

• отпаде́ние

  falling away, defection, break-away

• отсту́пничество

  apostasy, renegacy, defection (from a faith or cause)

  breach of faith, faithlessness, recreancy

• отщепе́нство

  apostasy, renegacy, defection from one's own group, deviationism

  disloyalty, breach of faith, faithlessness