September 6 in #Russia: 1689 — The Nerchinsk Treaty was concluded — the first treaty between the #Russian state and #China. 1790 — Catherine II ordered Russian subjects to return immediately to Russia from revolutionary #France. 1826 — The chain bridge over the Fontanka River was opened in Saint Petersburg. 1873 — The Khiva Khanate recognized its dependence on Russia. 1921 — Józef Piłsudski called on the head of the anti-Soviet underground, Boris Savinkov