MOSCOW, 24 Feb (ABC News) - Russia claimed Thursday to have neutralized some of Ukraine's military infrastructure amid an attack on the country.

"The military infrastructure of air bases of Ukraine's Armed Forces has been rendered inoperable," the Russian Ministry of Defense said in a statement. "Air defense systems of the Ukrainian Armed Forces have been suppressed."

The Russian defense ministry further alleged that Ukrainian forces on the border "are offering no resistance to Russian units."

Meanwhile, a statement from the Ukrainian Ministry of Defense claimed that five Russian planes and a helicopter had been shot down.

"Reports of foreign media on a Russian aircraft allegedly downed on the Ukrainian territory have nothing to do with the reality," the Russian defense ministry said Thursday.