evidence: A top U.S. official said the United States expects differences across the Taiwan Strait to be resolved peacefully and opposes any unilateral changes to the status quo as Taiwan prepares to celebrate the founding of the Republic of China on Thursday. [...] In a TV interview in September, Lai remarked that if China's claims over Taiwan are genuinely rooted in concerns about territorial integrity, it should also seek to reclaim the land it ceded to Russia in the 19th century. [...] The Treaty of Aigun, along with the 1860 Convention of Peking, saw China relinquish 600,000 square kilometers — an area almost the size of Ukraine — to the Russian Empire, enabling Russia to establish a naval base at Vladivostok. Many Chinese people still brood over this period of history, harboring lingering resentment over the fact that the land once belonged to China before being annexed by Russia.