Treaty of Björkö

Kaiser Wilhelm II Tsar Nicholas II
Heinrich von Tchirschky Aleksei Birilev

The Treaty of Björkö, also known as the Treaty of Koivisto, was a secret mutual defence agreement signed on 24 July 1905 in Björkö between Wilhelm II of the German Empire and Tsar Nicholas II of Russia. Although Wilhelm was the chief author, he acted without consulting his ministers. The treaty was quickly repudiated and never took effect.