It's actually a really interesting but of english.
We include 'the' when the type of government or state is mentioned which is why it is just China but it's the people's Republic of china or in the case of a region, like the Cotswolds.
Ukraine was referred to as the Ukraine during the soviet Union as it was a region of a greater country. Therefore using the Ukraine basically diminishes Ukraine to a territory of another country which is sorta what they're fighting not to be.
edit: deleted as I realized I was defending China and I don't want to do that. There are a great deal of massively problematic issues with their government which the comments here brought back to the front of my mind and I don't want to get into an argument where I'm defending Whinnie the Pooh's government.
I mean I don't agree with them but they could easily really with: "You're fine with restricting women's rights? You're fine with a country controlled by corporations? You're fine with police summarily killing people in the streets? You're fine with a media that intentionally lies to manipulate parts of the population into attempting a coup? You're fine with a small ghetto of inflected officials making arbitrary decisions on laws that take away fundamental rights based purely on religious and political ideology?"
A better argument would be to point to statistical data that shows that the US is still a better place to live than China. e.g. the US scores a 8.73 ^1 on the Freedom indeed while China only scored a 5.57 ^1.
Lewis on three wheels on Silverstone. Not only was it an impressive feat to still drive at pace on only the wheels, but the calmness of both Lewis and Bono as they counted down the seconds Max was behind them was mega.
Also the enjoyment of watching a moment like that as a fan of the sport was intense.
I'm really sorry, please forgive my ignorance, but I don't know what you mean.