culture fluid
A culture fluid person is someone who fluctuates between more than one culture, as a result of either being brought up in a multicultural environment or having lived in multiple countries during the course of life. They do not stick to one set of values and behaviour assigned to one particular culture, embracing multiple social, cultural and linguistic identities within themselves and manifesting these identities when appropriate.
At a recent interview I was asked if I identify as a Russian or a Brit. My reply was "I am culture fluid"