'eagle strike 8'; NATO reporting name: CSS-N-4 Sardine) is a Chinese surface-launched subsonic anti-ship cruise missile.

[3] The YJ-8 is either based on, or is a heavily modified copy of, the MM38 Exocet; the two missiles share virtually identical operational profiles.

The replication of the MM38's "revolutionary flight profile" in less than ten years and with an immature industrial base strongly suggests that China had access to proven technology.

According to a 1991 Aerospace China article, development of the missile's engine began in 1978, and flight testing was completed in 1985.

The YJ-8 reach initial operating capability in the People's Liberation Army Navy in 1987, the same year the export version—the C-801—was announced.