site.btaToday's Observances: May 31
![Today's Observances: May 31](/upload/679593/vn280904.jpg?l=1000)
![Today's Observances: May 31](/upload/679593/vn280904.jpg?l=1000&original=)
The world: - World No Tobacco Day. On this date in Bulgarian history: 1902: Russo-Bulgarian Military Convention signed in St. Petersburg to provide mutual military aid in case Bulgaria or Russia is attacked by Austria-Hungary, Romania
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