In a message to Russian President Dmitry Medvedev, Zardari said "nothing could justify such terrorist attacks against innocent persons," in a statement sent from his office late Monday.
"The people of Pakistan stood in firm solidarity with the Russian people and shared their pain and sorrow," Zardari said.
"Pakistan, itself, has been subjected to numerous terrorist attacks and we firmly believe that no effort be spared by the international community to eliminate this blight from the world."
Scenes of carnage unfolded at Domodedovo airport in southern Moscow on Monday as corpses were stretchered out of the arrivals area after the blast, which also wounded over 130 people.
Global leaders strongly condemned the blast.
US President Barack Obama used the word "outrageous," German Chancellor Angela Merkel called it "cowardly" and Spain slammed what it said was a "vile terrorist act".
"We should never allow the terrorists to win," British Prime Minister David Cameron said, while Australia branded the bombing a "terrible atrocity".
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