Among other things, perhaps the recent bombing of the Iranian section of a consulate in Damas, Syria by Israel, to which Iran responded by war threats.
I did in fact miss this, thanks. I'm not as convinced by other commenters' references to Putin's nuclear threats, but the Middle East erupting into a broader conflict with the US joining in seems at least somewhat plausible to me. Another comment mentioned the potential of the US entering a war in defense of Taiwan, which also seems quite plausible to me given China really wants Taiwan back and Taiwan is much more critical to the US than, say, Ukraine.
