'East Wind 4') or DF-4 (also known as the CSS-3) is a first-generation two-stage Chinese intercontinental ballistic missile[7] with liquid fuel (Nitric acid/Unsymmetrical dimethylhydrazine).

It was thought to be deployed in limited numbers in underground silos beginning in the late 1970s and early 1980s.

The Dong Feng 4 has a takeoff thrust of 1,224.00 kN, a takeoff weight of 82000 kg, a diameter of 2.25 m, a length of 28.05 m and a fin span of 2.74 m. The range of the Dong Feng 4, which is equipped with a 2,190 kg nuclear warhead with 3.3 Megaton yield, with a nominal range of 5,500 km.

This gives it sufficient range to strike targets as far away as Russia, India, and American bases in the Pacific.

[9] The decision to develop the DF-4 was made in 1965[10] in response to the U.S. ballistic missile submarine patrols that began operating out of Guam.