Except, PRC "Final Warnings" has preluded actual war or near actual war with every NPT nuclear state, a few times when PRC wasn't (or not meaningfully) a nuclear power herself, on issues much less important than TW, when PRC was much more militarily weak than it is now. This includes USSR skirmishes (hence why the Soviet meme is stupid), US+UN in Korea, threatening UK over HK handover, secretly shelling French in Vietnam, multiple TW strait crisis. To add insult to injury, with respect to source of this meme, PRC "final warnings" throughout this period shot down 5 U2s, that's 3 more than USSR. So not only was PRC following up with warnings, but they managed to do so more successfully than USSR.