As well as China, see the US developing larger rnds to defeat their BA and maybe be following us down that rabbit hole. Small arms arms race basically;
Russia’s experimental AK-22 is built around a new 6.02×41mm cartridge designed to defeat modern body armor and extend effective range. Developed as a response to the U.S. NGSW program, the round delivers higher energy at distance while maintaining controllable recoil for automatic fire.