honolulu president barack obama thursday authorize series sanction russia intervene 2016 u.s. presidential election warn action come action follow repeat private public warn issue russian government necessary appropriate response efforts harm u.s. interest violation establish international norms behavior obama say statement action sum total response russia aggressive activities continue take variety action time place choose publicize say obama say report administration russia efforts interfere 2016 election would deliver congress come days obama sanction russia intervene 2016 election