Many American munitions with satellite guidance in Ukraine couldn't withstand Russian GPS jamming technologies. This forced the Ukrainian Armed Forces to cease the use of certain types of Western weaponry after their effectiveness sharply declined, according to The Washington Post.
According to senior Ukrainian military officials, the obstacles created by Russia to the targeting systems of modern Western weapons, including GPS- guided artillery shells like Excalibur and the artillery rocket system HIMARS, have undermined Ukraine's ability to defend its territory.
The success rate of US-developed Excalibur shells, for example, sharply declined over several months to less than 10 percent of target hits.