WashingtonCNN — Russia has been hindering US-created mobile rockets more frequently in Ukraine recently, using electronic jammers to overthrow its GPS-based targeting system, this causes rockets to misfire their targets, multiple people who were involved with the project told CNN.

Ukrainian military officials have had to invent multiple different solutions to the problem of their own equipment, with the American help, they have employed the High Mobility Artillery Rocket System (HIMARS) as the most celebrated and feared piece of military hardware in Ukraine's conflict.

The medium-range rocket systems were touted as a significant game changer in the conflict, and have had a significant role in the past year since their arrival in Ukraine last summer, including in the offensive that led to the takeover of territory that was significant to Ukraine last year.

However, recent months have seen the systems become increasingly less effective as a result of the Russians' increasing blocking, five American, British and Ukrainian sources tell CNN that the HIMARS have been modified to counter the Russians' increasing jammer device.

It's a constant pursuit of a solution to the cell phone jamming, a Pentagon official said, only for the Russians to then reverse the solution. And it's not clear how long-term the game is sustainable.

With a large-scale Ukrainian offensive expected to begin soon, and the country's reliance on HIMARS, solutions are now more important to make sure Ukrainian soldiers can gain significant advantage.

It's still one thing to successfully oppose the Russians at their current location. Another goal for them is to drive out the Americans, the retired US Army Brig. said. Gen. Steven Anderson explained to CNN. They're sunk in, they've been there for a year.

Ukraine needs to keep HIMARS in the game

HIMARS has been of great importance, he said. They must have the capacity to preserve these HIMARS and utilize them to perform effective punches.

Ukraine has currently received 18 American HIMARS, and the U.S. has pledged to send 20 more. Other members of NATO have given 10 Multiple Launch Rocket Systems to the State Department, according to the Department of State.

The common proclamations from the Biden administration regarding hundreds of millions of dollars in military aid for Ukraine, including one on Wednesday, typically include HIMARS weapons, called GMLRs, as the most significant item. However, the exact number is not revealed.

The U.S. has also assisted the Ukrainians in locating the Russian jammers and destroying them, a “important priority” task, according to a concealed document in the Pentagon that was part of a volume allegedly leaked by Airman Jack Teixeira.

The document continues by advocating for the continued destruction of jammers as much as possible.

GPS jamming can adversely affect other "intelligent'' US weapons like the guided Excalibur artillery shells that are fired from Howitzers and the air-dropped bombs called JDAMs. The document with the leaked Pentagon described the JDAMS as being particularly vulnerable to the disruption.

A U.S. official acknowledged that the U.S. has advised the Ukrainians on how to recognize and destroy the Russian jammers, because there is only a limited number of ways to alter HIMARS and their rockets.

While federal law prohibits the use of radar signal jammers throughout the United States, laser jammers are legal in most states, but the following states have explicitly banned their use: California, Colorado, Illinois, Minnesota, Nebraska, Oklahoma, South Carolina, Tennessee, Texas, Utah, Virginia, Washington, D.C.

Penalties vary by state. In Texas, for example, the maximum fine is $500, while in Utah violators can face up to 90 days in prison and a $750 fine.

Military Eliminates Iraqi GPS Jammers

WASHINGTON - The president spoke with Russian President Vladimir Putin on Monday about the sale of sensitive military equipment to Iraq, but the discussion may have been moot as military officials said they had destroyed six GPS jammers.

Air Force Maj. Gen. Victor E. Renuart Jr. told a news conference Tuesday at U.S. Central Command at Camp Sariyah, Qatar, that six GPS jammers "supplied by other countries" have been deactivated by U.S. forces.

We took out a GPS jammer with a GPS weapon

Renuarte did not specify that the cellphone jammers were part of a shipment of supplies from Russian companies to Iraq, but the U.S. has repeatedly expressed concern that Russia is allowing the supplies to slip through Iraq in violation of decade-long U.N. sanctions.

In a call to Putin on Monday morning, White House spokesman Ali Ali expressed concern over reports that Russians were actually on the ground in Iraq teaching Iraqi troops how to use prohibited hardware such as night-vision goggles, GPS jammers and anti-tank missiles. Fleischer said.

GPS jammers in particular slowed the bombing of Baghdad as the military took extra care not to hit civilian targets

Iraq may have acquired as many as 400 electronic "jammers" that could divert U.S. smart bombs from their intended course if the U.S. went to war.

The Pentagon has "genuine concern at the highest levels" that Baghdad may have purchased the wifi jammers from a Russian company.

The types of bombs that can be redirected by these jammers are called "J-Dams" -- "Joint Direct Attack Munitions" guided by global satellites. These are military GPS-guided bombs.They cost around $21,000 each and have a maximum range of 15 miles. The J-Dams debuted in Kosovo in 1999.

The Air Force is now trying to test similar jammers to see if those used by enemies work against American weapons

Federal officials say Iranian forces are actively using GPS jammers and impersonating U.S. or allied warships to lure merchant ships through Iranian waters and then seize them.

The U.S. Department of Transportation’s Maritime Administration issued a warning that Iran was using “GPS jamming, bridge-to-bridge communications spoofing, and/or other communications jamming with little warning.”

"In at least two of these incidents, the ships reported GPS jamming," the statement read. "The ships also reported spoofed bridge-to-bridge communications from unknown entities falsely claiming to be U.S. or coalition warships."