This is a postcard with the caption in Russian, reading “Парижскій Салонъ 1910. Боксеры. — Жанъ Шарль Піерръ Ля Пались.” The caption translates as “Paris Salon 1910. The Boxers. — Jean Pierre Charles de Chabannes La Palice.” This particular image of the postcard appears to have been scanned and posted to Flickr in 2010. A similar postcard with the same caption in French may be seen here. The image on both postcards is, according to the captions and to this page, a work by Jean Pierre Charles de Chabannes La Palice called The Boxers, which was indeed exhibited at the 1910 “Salon des Artistes Français”:

Depicted, presumably, is a fanciful scene from the Boxer Rebellion, during and after which many lurid accounts of rape and torture circulated.
Image provenance by Bacchus at Erosblog.