Rebels are pouring more resources into their battle for the government-held Donetsk airport.

There's been no let up in the attacks and pro-Russian separatists have suffered more casualties in recent weeks --- despite an official ceasefire that went into effect a month ago.

This, according to Ukraine's Military Spokesman, Andriy Lysenko:

(SOUNDBITE) (Ukrainian) UKRAINIAN NATIONAL SECURITY AND DEFENCE COUNCIL SPOKESMAN, ANDRIY LYSENKO, SAYING:

"Rebels made several other, fortunately unsuccessful, attempts of storming the airport. After that they continued firing at it. Our servicemen rebutted all attacks and killed 12 terrorists."

He also said two Ukrainian servicemen were killed in the past 24 hours.

Yet the battle rages on...

And officials are accusing Russian forces of aiding separatists in their increasingly fierce fight for the airport.