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On the evening of Feb. 6, the Russian ballerina Anzhelina Vorontsova had to take another trip abroad — this time to Italy — for some performances she wished she had been able to decline. Winsome as a porcelain doll and sublime on the stage, the 21-year-old had little desire to take time away from her work at the Bolshoi Ballet, the legendary Moscow company where she has been a soloist since 2009. But her Bolshoi salary is “miserly,” she says, and moonlighting abroad is her only way to make a decent living.