https://bgr.com/science/china-successfully-modified-the-weather-to-create-clear-skies-researchers-say/
This tech will be important in future wars.
Better article:
https://www.scmp.com/news/china/science/article/3158417/china-modified-weather-communist-party-marked-centenary-beijing
It's just lots and lots of rockets of silver iodide (apparently), so not a new technology per se. It's more, as in with so many things, China's capacity and willingness to use that capacity to help the Party is what is different.
One fear that people always raise with geoengineering is not that people will use it in wars, but that it will be a cause of war.