Treaty of Aigun
Russia followed the United States, Britain, and France in establishing relations with Japan, and, together with Britain and France, Russia obtained concessions from China consequent to the Second Opium War (1856–1860). Under the Treaty of Aigun in 1858 and the Treaty of Beijing in 1860, China ceded to Russia extensive trading rights and regions adjacent to the Amur and Ussuri rivers and allowed Russia to begin building a port and naval base at Vladivostok.