(CNN) — Explosions at two Russian airbases on Monday focused attention Ukrainian efforts To develop long-range combat drones.

The Russian Defense Ministry said the attack was carried out by Ukrainian drones and claimed it was shot down by Russian air defenses. Satellite and photographic images indicate some damage to a Russian military aircraft at a base in the Ryazan region.

Ukraine’s Defense Ministry has not made any official comment on the blasts, and the Ukrainian government has not acknowledged adding long-range attack drones to its arsenal.

However, state arms maker Ukroboronprom has indicated several times in recent weeks that it is close to completing work on a new long-range drone.

In October of this year, Ukroboronprom posted on Facebook with a picture of what appears to be part of the drone’s structure: “The range is 1,000 km, the weight of the combat unit is 75 kg. The final touches are being made.”

A month later, on November 24, Ukroboronprom made another publication: “The next stage of UAV tests: on behalf of the Chief of the General Staff, we are preparing for flight tests in the operation of electronic warfare.”

“Climate, on the one hand, becomes a problem, on the other hand, it is an additional test for the complex. Kind of a crash test.”

A photo drone has the words “As Wosdam” written on it, meaning “I will pay”.

“Several stages of successful testing have been completed,” company spokeswoman Natalia Zad told Ukrainian television, Ukrainform news agency reported on Saturday.

“In accordance with the instructions of the Chief of the General Staff of the Armed Forces of Ukraine, we are moving to the test phase involving an electronic combat jamming environment,” it added.

However, there is no public indication that the drone in question is ready for deployment or involved in bombings inside Russia. Monday Earlier.

Attack on Russian bases

According to the Russian Defense Ministry, the two bases under attack are hundreds of kilometers apart. Within Russian territory Ukraine’s declared drone arsenal is out of bounds. No pictures or images of the drone debris have been released.

In the western Russian town of Engels, more than 800 kilometers southeast of Moscow, security camera footage showed an explosion in the sky at 6 a.m. local time on Monday.

The port city of Engels-2 Airfield, a strategic bomber airbase, is about 6 km from the location where the CCTV footage was recorded.

Saratov Region Governor Roman Busargin assured residents by Telegram that civilian infrastructure was not damaged, but said “law enforcement agencies are reviewing information about incidents at military facilities.”

He acknowledged information about “a major crash and explosion in Engels in the morning” that was circulated on social networks and the media.