U.

S.

President Barack Obama says he told RussianPresident Vladimir Putin in September to stop meddling in the American presidential election,.

Warning of serious consequences if Moscow continues its alleged cyberattacks.

Giving his last news conference of the year,.

President Obama said the hacking stopped afterthat.

He has promised a "proportional" responseto the hacking of the Democratic Party and of emails belonging to defeated presidentialcandidate Hillary Clinton's campaign chairman, John Podesta.

Russia denies any involvement,.

callingthe claims "indecent".

President Putin's spokesman said the U.

S.

Government needed to either stop talking about it or finally present some proof of wrongdoing.