With the end of the Cold War, this boundary issue was discussed through negotiations. In 2004, Russia agreed to transfer Yinlong Island and one half of Heixiazi Island to China, ending an enduring border dispute. Both islands are found at the confluence of the Amur and Ussuri Rivers, and were until then administered by Russia and claimed by China. The event was meant to foster feelings of reconciliation and cooperation between the two countries by their leaders, but it has also provoked different degrees of dissent on both sides. Russians, especially Cossack farmers of Khabarovsk, who would lose their ploughlands on the islands, were unhappy about the apparent loss of territory. Meanwhile, some Chinese have criticised the treaty as an official acknowledgement of the legitimacy of Russian rule over Outer Manchuria, which was ceded by the Qing dynasty to Imperial Russia under a series of "Unequal Treaties", which included the Treaty of Aigun in 1858 and the Convention of Peking in 1860, in order to exchange exclusive usage of Russia's rich oil resources. The transfer was carried out on October 14, 2008.