The mainland should both find ways to make sure they get access to the shit being sent/sold to Taiwan to strip-down and obvious shit for better understanding the builds and tech. And make a big show about how the US breaks its own rules on selling arms to supposed adversaries. But also sending "thanks to the USA for the toys" bit of snark, as they are supplying China with weapons. Would be funny to see such an announcement and have all kinds of war vehicles and other high value weapons paraded around with the PLA markings added to them.
Would be hilarious to see both capitalist parties and the military industrial complex have to deal with the massive L in the media. Or at least the idea of such a massive multi-decade sale of arms, and thus arming of, such a big enemy of the US scandal sounds amazing to me. Hell make it even more a "fuck you" by the PLA transferring US made shit to the DPRK and really all other socialist nations that want them. lol