site.btaToday's Observances: May 31
![Today's Observances: May 31](/upload/279224/1032219.jpg?l=1000)
![Today's Observances: May 31](/upload/279224/1032219.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 or Triple
/PP/
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