The Chairman of the Verkhovna Rada, Ruslan Stefanchuk, appealed to senoir members of Congress with a request to assist Ukraine with additional air defence systems to counter Iranian kamikaze drones.

Stefanchuk calls on the U.S. to provide Ukraine with highly mobile air defence systems known as C-RAMs, saying they would help protect "important objects, especially crucial power plants," as reports ABC News that obtained the Stefanchuk's letter to Congress.

C-RAMs have a built-in radar to track incoming threats and a giant rapid-fire gun to shoot them down, with NATO saying the "most effective" systems are able to fire 4,500 rounds per minute.

A senior Ukrainian politician told ABC News that the Ukrainian government has also made an official request to the Biden administration for the C-RAM systems.

Pentagon spokesperson Lt. Col. Garron Garn told ABC News this week that U.S. support "focuses on equipment that is relevant for the current fight."

"We are working around the clock to fulfill Ukraine's priority security assistance requests, delivering weapons from U.S. stocks when they are available," he added.

Currently, Ukrainian officials say they use an array of methods to shoot down the drones.

Ukrainian fighter jets are being used to track them and, in some cases, shoot them down, according to the Ukrainian politician briefed on the matter.

In his letter, Stefanchuk also asks senior U.S. lawmakers to assist him in asking the Biden administration to provide longer-range missiles so that the Ukrainian military could destroy targets such as "stocks of Iranian drones, deep behind the enemy lines on the occupied territory of Ukraine."

On Monday, Ukraine's defence minister announced that advanced air defence systems had arrived in Ukraine to counter Russian NASAMS missiles. A high-ranking American official confirmed that two systems had been delivered to Ukraine.

In August, the U.S. announced that it had promised six more NASAMS launchers to Ukraine.