Many (but not all) Japanese four-character idioms (yojijukugo) are actually Chinese imports, and they're IMHO far more prevalent in that language.
My favorite one is 吴越同舟 or 呉越同舟 (Wú Yuè tóng zhōu) meaning people of different backgrounds finding themselves having to work together.
https://www.zdic.net/hans/%E5%90%B4%E8%B6%8A%E5%90%8C%E8%88%...
https://jisho.org/word/%E5%91%89%E8%B6%8A%E5%90%8C%E8%88%9F
If only the two countries were as close diplomatically as they are in their shared culture.
https://openlibrary.org/works/OL27733147W/Kanji_idioms?editi...