Borscht, blintz, knish latke (ultimately from Greek), (all via Yiddish, although some may be Ukrainian in origin), kvass, knout (via French), boyar, tsar (also spelled czar), duma, ruble, pogrom, refusenik (part calque of отказник (otkaznik), glasnost, peristroika, gulag, sputnik, soyuz, samizdat, soviet, Bolshevik, menshevik. Though my favorite Russian loan is Japanese ikura 'salmon roe' < Russian икра (ikra). For more, see Wikipedia article.

Ceci n'est pas un seing.