Videos showed fireballs over a facility in Ryazan, 110 miles southeast of Moscow. Kyiv is seeking to disrupt Russian military logistics and put pressure on the country’s economy by striking its oil industry.

The unmanned aircraft carrying explosive warheads are part of a Ukrainian campaign of long-range drone attacks that aim to inflict blows on Russia far behind the front line as Moscow's troops advance in the east.

Ukraine is using unmanned aircraft carrying explosive warheads as part of a campaign of long-range drone attacks, aiming to inflict blows on Russia far behind the front line. Kyiv's military granted Reuters exclusive access during the launch of the drones.

Lt. Gen. Kyrylo Budanov said North Korea has already provided Russia with 120 self-propelled artillery guns and 120 multiple-launch rocket systems, with more to come.

Britain's defense ministry said about 1,000 North Korean soldiers have been killed and around 3,000 more wounded fighting against Ukraine.

The South Korean military reports on North Korea's plans to send additional troops to Russia, attributing this decision to numerous casualties. North Korea is preparing to reinforce its military presence in Russia.