In a new round of war of words, Russian President Dmitry Medvedev has made an unprecedented attack on his Belarussian counterpart Alexander Lukashenko who has enjoyed Moscow's support for sixteen years.
Mr Medvedev's strong attack comes when Mr Lukashenko faces re-election in December.
Speaking in his weekly video blog, President Medvedev accused Mr Lukashenko of ''hysterical'' anti-Russian rhetoric. He was responding to the latter's allegations that Russia was interfering in the election.
Russia and Belarus are usually close, but recently ties have been strained.
Belarus receives considerable economic assistance from Russia, and since taking power 16 years ago, Mr Lukashenko has had strong support from the Kremlin.
Whenever the West accused the Belarusian President of rigging elections, or of repressing political opponents, Moscow always took his side.
But recently President Lukashenko has been more critical of Russia.