What nations claimed to protect christian interests in the ottoman empire?
germany and spain
the united states and france
france and russia
britain and russia

The nations that claimed to protect Christian interes in the Ottoman Empire were the French and Russian Empire at the time. Both of them considered themselves to represent and protect what were the christian interests of the time. There are, however conflicting arguments whether this is true or not. 

Hope this helps :)

Russia and france are the ones who decided to protect them