Thirty years ago, on March 15, 1994, President Leonid Kravchuk annulled a referendum initiated by Crimean President Yuriy Meshkov, which asked citizens questions regarding the broadening of the region’s autonomy. Mr. Kravchuk issued a presidential decree to halt the referendum, scheduled for March 27 during parliamentary elections, and called the action unconstitutional. However, Mr. Meshkov...