The Russian soprano Anna Netrebko is opera’s biggest star. But her career is in disarray because of her ties to Putin, and arts companies around the world are divided on whether to welcome her back.

FILE - Russian soprano Anna Netrebko bows to the audience at the end of La Scala opera house's gala season opener, Giacomo Puccini's opera "Tosca" at the Milan La Scala theater, Italy, on Dec. 7 ...

Anna Netrebko has withdrawn from her planned role debut in Johann Strauss's Ariadne auf Naxos at the Vienna State Opera, citing ill health earlier this month that limited her preparation.