NEW : Draft resolution slapping tighter sanctions on Iran circulates at U.N. Russian PM Putin says Israeli attack on Iranian coast is ' unacceptable ' Israeli ambassador walks out on Ahmadinejad government . Iranian president says last week 's flotilla raid showed Israel 's ' devilish ' intentions .
NEW : Draft resolution slapping tighter sanctions on Iran circulates at U.N. Russian PM Putin says Israel raid on aid flotilla is 'unacceptable ' Israeli ambassador walks out on Ahmadinejad speech . Iranian president says last week 's flotilla raid showed Israel 's 'devilish ' nature .