A RUSSIAN mother told witnesses she threw her two young sons to their deaths from a 15th floor balcony because she was "fed up" with them, RT News reported Monday.

Galina Ryabkova, 30, allegedly tossed her sons, aged four and seven, from the Moscow apartment building where she lived with her husband.

Ryabkova reportedly later told witnesses she was "fed up with children" and "decided to get rid of them."

Stunned neighbors were alerted to the horrific incident when they heard the thump of the children's bodies hitting the ground.

"I was standing near the window and heard a loud smack," resident Tatiana Gumanyova told Life News.

"I did not pay attention, [and] thought that the child just stumbled and fell. But then I heard one more smack."

Another unnamed resident said, "My wife woke me up and said that there were children falling out. We ran out and saw two children lying on the ground in front of the main door.

"Just at that time their mother was leaving the building. We asked her if these were her children and she replied, emotionlessly, 'Yes, I threw them away.'"

Ryabkova was said to be calm before police arrived, although she resisted slightly when they arrested her.

She later told investigators that her children were now "angels in heaven," RIA Novosti reported.

Investigations are continuing.