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% replaces any number of letters (la% - lake, lamp)_ replaces one letter (ca_ - car, cat)

Crossword clues for Russian who ruled:

TSARISM: Autocratic Russian rule
UKASE: Russian ruling
TSARISM: Old autocratic Russian rule
TSARINA: Russian who ruled
HOLYSYNOD: Russian Orthodox ruling body
TROIKA: Ruling threesome, from the Russian