U.S. Altered Himars Rocket Launchers to Keep Ukraine From Firing Missiles Into Russia

The U.S. secretly modified the advanced Himars rocket launchers it gave Ukraine so they can’t be used to fire long-range missiles into Russia, U.S. officials said, a precaution the Biden administration says is necessary to reduce the risk of a wider war with Moscow.

The U.S. since June has supplied Ukrainian forces with 20 High Mobility Artillery Rocket System launchers, or Himars, and a large inventory of satellite-guided rockets with a range of almost 50 miles. Those rockets, known as the Guided Multiple Launch Rocket System, or GMLRS, have been used to strike Russian ammunition depots,...