Russian jamming seems to be affecting Ukraine's communications and US-provided weapons, experts say.
"The problem may well be the sheer power of the jamming signal that can be brought to bear," Withington said.
"Moreover, the closer the GPS receiver is to the R-330Zh's jamming antenna, the stronger the jamming signal becomes."
Russia's counter-GPS efforts are part of a massive electronic-warfare campaign that has also disrupted Ukrainian radio communications and drone operations.
John Moore/Getty ImagesAccording to the RUSI report, Russian EW troops are also "highly capable" at intercepting and decrypting Ukrainian radio communications.
Persons:
—, Thomas Withington, Withington, Serhii, HIMARS, Worthington, Denis Abramov, Mil.ru Worthington, Russia's, John Moore, hasn't, countermove, Michael Peck
Organizations:
Ukrainian, Service, Ukraine —, NATO, Britain's Royal United Services Institute, Pentagon, Getty, U.S, GPS, Russian Defense Ministry, Mil.ru, Russian, Russian GPS, Russian Army, Defense, Foreign Policy, Twitter, LinkedIn
Locations:
Russia, Ukraine, Russian, Soviet, Ukrainian, Kharkiv Oblast, Withington, Forbes