President Barack Obama vowed Friday to send a "clear message" to Russia for trying to sway the US election, while calling on Donald Trump and Republicans to put national security before politics.
Obama all-but accused Russian President Vladimir Putin of personally ordering an audacious cyber hack that many Democrats believe gravely wounded Hillary Clinton in a closely fought election.
The US intelligence community has concluded that a hack-and-release of the Democratic Party emails was designed to put Trump -- a political neophyte who has praised Putin -- into the Oval Office.
But with tensions rising between the world's two preeminent nuclear powers and US political anger near boiling point after Trump's shock election, Obama sought to exude calm while promising a measured response.
Assuring Americans that the ballot itself was not rigged, he promised to "send a clear message to Russia or others not to do this to us, because we can do stuff to you."
Noting that "not much happens in Russia without Vladimir Putin," Obama said he had personally told the former KGB officer when they met in September to "cut it out."
"In fact we did not see further tampering of the election process," he told journalists before heading for his Christmas vacation in Hawaii.
Regarding specific acts of retaliation, Obama said some would be carried out publicly, but that in other cases, "the message will be directly received by the Russians and not publicized."
Obama belittled Russia as a second rate power with little going for it, using language that is sure to infuriate the status-conscious Russian leader.
"The Russians can't change us or significantly weaken us. They are a smaller country, they are a weaker country, their economy doesn't produce anything that anybody wants to buy except oil and gas and arms. They don't innovate."
But Obama's sternest message may have been for Trump and other Republicans who have played down the cyber attack.
Obama urged the president elect -- who has repeatedly questioned Russia's involvement -- to accept an independent nonpartisan investigation.
Obama also warned Trump against provoking a "very significant" response from China by reaching out to Taiwan.
Trump has broken with four decades of US diplomacy by suggesting Washington's "One China" stance may be reviewed and by accepting a call from Taiwan's President Tsai Ing-wen.
Beijing regards self-governing Taiwan as part of its sovereign territory and has already expressed anger at Trump's move.