Supposedly there was talk that Donetsk and Luhansk would function as autonomous administration regions within Ukraine (I guess, a bit like Xinjiang, Tibet, and Inner Mongolia are in China?), but I can’t find a source for that.
The claim that the only option for peace in the Taiwan conflict is if China gives up is, frankly, untrue. Under the KMT government (2008-2016), China had basically accepted the status quo (Taiwan with de facto independence). This is why cross-strait dialogue was so positive in the 2008-2016 period.
In 2008, the KMT said that “it is the “common aspiration” of the people from both sides of the Taiwan Straits to build a peaceful and win-win future” and the CPC confirmed this, saying “The two parties said they wished to enhance exchanges and dialogue, reach common ground on issues, increase mutual trust and promote cooperation, and take more responsibility for peace and development across the Strait.” In confirmation of the 1992 Consensus, both parties agreed in 2009 to “avoid internal struggle in foreign affairs.” In 2013, both parties agree to work towards " rejuvenating the Chinese nation." In 2015, the CPC called on people to remember the shared bond between CPC-KMT in the fight against the Japanese imperialists. Then, of course, there was the landmark meeting between the CPC leader Xi Jinping and the KMT leader Ma Ying-Jeou in 2015.
Since then, relations have deteriorated rapidly under the DPP. Dialogue from Taiwan has shifted from one of maintaining the status quo to one seeking explicit independence (DPP policy, which contradicts KMT policy). Dialogue from China has shifted from one of building relations to one of “avoiding conflict.”