Speaking to journalists in the Russian far-eastern city of Vladivostok, Mr Putin urged Mr Obama - as a Nobel Peace Prize laureate - to think about future victims in Syria before using force.
He said it was ridiculous to suggest the Syrian government was to blame for the attack, calling it a "provocation by those who want to drag other countries into the Syrian conflict".
....He said that the US failure to present evidence to the international community was "simply disrespectful".
"If there is evidence it should be shown. If it is not shown, then there isn't any," he said.As Gerard Debreu said (in explaining his work upon receiving the Nobel Prize), In the real world, when you push people, they push back.