If China Wants Taiwan It Should Also Take Back Land From Russia, (Taiwan’s) President Says
US News & World Report:
“If China’s claims on Taiwan are about territorial integrity then it should also take back land from Russia signed over by the last Chinese dynasty in the 19th century, Taiwan President Lai Ching-te said in an interview with Taiwanese media...
...Lai, who China calls a “separatist”, brought up the 1858 Treaty of Aigun in which China signed over a vast tract of land in what is now Russia’s far east to the Russian empire, forming much of the present day border along the Amur River.
China’s Qing dynasty, then in terminal decline, originally refused to ratify the treaty but it was affirmed two years later in the Convention of Peking, one of what China refers to as the “unequal” treaties with foreign powers in the 19th Century...
...”If it is for the sake of territorial integrity, why doesn’t it take back the lands occupied by Russia that were signed over in the Treaty of Aigun? Russia is now at its weakest right?” he added.”
Manchuria:
On February 14, 2023, the Ministry of Natural Resources of the People’s Republic of China relabelled eight cities and areas inside Russia in the region with Chinese names.The eight names are Boli for Khabarovsk, Hailanpao for Blagoveshchensk, Haishenwai (Haishenwei) for Vladivostok, Kuye for Sakhalin, Miaojie for Nikolayevsk-on-Amur, Nibuchu for Nerchinsk, Outer Khingan (Outer Xing’an) for Stanovoy Range, and Shuangchengzi for Ussuriysk
https://en.wikipedia.org/wiki/Outer_Manchuria