A ballet dancer from Los Angeles is being detained in Russia on treason charges. Here's what to know.

Russia's main domestic intelligence agency has arrested a woman with dual U.S. and Russian citizenship on charges of treason, accusing her of collecting money for the Ukrainian military. Authorities did not name the woman, but her longtime employer in California identified her as Ksenia Khavana, whose maiden name is Ksenia Karelina.

The Federal Security Service said in a statement early Tuesday that the Los Angeles resident was arrested in the Ural Mountains city of Yekaterinburg, about 1,100 miles east of Moscow. She had returned to Russia to visit family.

Here is what is known about Khavana and Russia's case against her.