Treaty of Saint Petersburg (1875)

The Treaty of Saint Petersburg (Japanese: 樺太・千島交換条約, romanized: Karafuto-Chishima Kōkan Jōyaku; Russian: Петербургский договор) between the Empire of Japan and the Russian Empire was signed on 7 May 1875, and its ratifications exchanged at Tokyo on 22 August 1875. The treaty itself went into effect in 1877.

Source: Wikipedia — Treaty of Saint Petersburg (1875) (CC BY-SA 4.0)