Russia’s electronic warriors are intercepting Ukrainian troops’ communications and jamming their...

Russian jamming has become so effective that Ukraine — as well as the US and NATO — can no longer assume that Joint Direct Attack Munition glide bombs and other smart weapons will hit their targets.

That’s the conclusion of an analysis by Britain’s Royal United Services Institute. “Jamming is not causing the JDAMs to stop working, but it is risking their accuracy,” according to RUSI researcher Thomas Withington.

While anti-jamming upgrades to JDAM may mitigate the problem, Russian electronic-warfare systems can simply drown out the GPS guidance signal from satellites. “The problem may well be the sheer power of the jamming signal that can be brought to bear,” Withington said.

The warning comes after Pentagon documents leaked in April revealed concerns that Russian jamming was reducing the accuracy of American guided weapons, including JDAM as well as HIMARS rockets.