From Ukraine problem's point of view, Taiwan's problem.look at the historical relationship between Ukraine and Russia.

Photo by George Chernilevsky (licensed under CC0 1.0)

The reason why Russia won't let go of Ukraine

Russia will not give up Ukraine in a historical sense because it originated from Kiev.Kiev has long been the capital of Russia.In the first half of the 13th century, the Grand Duchy of Kiev was overthrown by the Mongol Empire, effectively controlling Russia's major cities for 200 years.

After the Grand Duchy of Moscow recaptured the area, the capital became Moscow, and in 1713, Peter moved the capital to St. Petersburg to escape from the Chinese economic and cultural circles, and Russia's Europeanization policy took place.Peter is the name of the apostle who served Jesus, the etymology of Peter.Peter in English, Peter in Slavic, Peter in German and Pierre in French.You must have heard all the names somewhere.Lenin revolutionized in 1917, and the capital became what it is now Moscow.

If you think about the current composition, history is different.

When I learned world history, it was like this, but the Russian Empire covered the eastern half of Ukraine and the Soviet Union covered Ukraine.Even after Ukraine's independence, Russia's origin is mainly Kiev.Ukraine is now independent, and many say Russia originated in the Grand Duchy of Moscow and Ukraine originated in the Grand Duchy of Kiev.Either way, it happened in the same area, so there won't be much difference.

The Qing Dynasty, which used Taiwan as a place other than its naturalization

This problem has a lot in common with Taiwan.At least Xi Jinping argues that Taiwan has historically been China and that it is of the same ethnic group.The only difference is that China has called Taiwan "outside of the chinese cultual world" and has not exchanged.When 57 Japanese fishermen were killed in the 1871 Miyakojima disaster, they said they were not responsible for what the people outside of the chinese cultual world did.Considering the same structure as Ukraine, it would be equivalent if the cultural sphere centered on Xi'an entered NATO.In any case, the move will serve as a precedent to justify China's claim internationally.