90% of the Ukrainian military airports, where the integral part of military aviation was based, have ceased to function, Russian Defense Ministry spokesperson Igor Konashenkov revealed Wednesday.

At the beginning of the military operation, he said, the Ukrainian armed forces had up to 250 valid combat aircraft and helicopters, and the Russian Air Force destroyed 89 combat aircraft and 57 helicopters.

"On March 9, Russian Air Force bomber and fighters destroyed 49 military facilities, namely two command posts, six anti-aircraft missile systems, four ammunition and fuel depots, and 37 areas with a high concentration of weapons and military equipment," the spokesperson said.

In total, according to Konashenkov, 2,786 military infrastructure facilities in Ukraine were destroyed during the operation.

"The Ukrainian authorities are trying to make up for the lack of intelligence on the situation in the air through obtaining data from the Vinnitsa Air Force Command Center from the E3A aircraft of the Osa anti-aircraft missile system," Konashenkov said.

The Russian Ministry of Defense unveiled public documents confirming the Kiev authorities' preparations for an offensive operation in Donbass in March.

Official representative of the Russian Defense Ministry, Major General Igor Konashenkov said, "In the course of a special military operation, secret documents of the command of the National Guard of Ukraine came into the possession of the Russian military. These documents confirm covert preparation by the Kiev regime of an offensive operation in Donbass scheduled for March 2022."

US Under Secretary of State for Political Affairs Victoria Nuland divulged Tuesday that their eastern European allies had biological research facilities and that Washington was concerned that they could come under the control of the Russian forces.

Moscow had announced Wednesday a humanitarian ceasefire in Ukraine for Wednesday morning to carry out the evacuation of the civilian population.

Russia had launched a special military operation in Ukraine for several reasons, such as NATO's eastward expansion, the Ukrainian shelling of Donbass, and the killing of the people of the Donetsk People's Republic and Lugansk People's Republic, in addition to Moscow wanting to "denazify" and demilitarize Ukraine.