Keeping non-Muslim women as slaves

In Islam, it has been allowed to have intimacy with slave women and to even have children from them. Islam also prescribes the rights of slave women which are the responsibility of the master. And slave women traditionally have been the unbeliever women, who were purchased or captured during wars they waged on Muslims.

My question is that, can a wealthy Muslim man living in a non Muslim country, exercise the provision of keeping unbeliever women as slaves? Whereas unbeliever women are willing to live with him (with free will) on the same rights/conditions prescribed in Islam for slave women. What is the ruling on keeping non Muslim slave women this way?