You might be right, because over
here, it shows his involvements in other peace treaties involving Iran and other countries, but then I'm a bit concerned on his plan to take over Taiwan because no matter how one sees it, he's still doing one thing(brokering peace) and going ahead to planning his own attack. Plus, like you duly observed, I doubt he can be able to go ahead with the war. I mentioned it earlier but his military squad would need much training since there hasn't been a fight since 1979 against Vietnam.
China can move in isolation from alliances, since Taiwan follows China as an independent region, and it is assumed that its return to the Chinese bosom will happen within a few years, which is what Taiwan, which enjoys self-rule, will be forced to abandon. China guarantees the loyalty of Russia and its allies because they need it to support their colonial or defense projects.
Taiwan, on the other hand, has no pressure card except for semiconductor production plants, and its supporters, including the United States, will abandon them if they succeed in finding alternatives. The world's production of semiconductors is controlled by a few companies, and the big countries are seeking to compensate for this shortfall so that there is no room through which China can exert pressure.