"The Iranian nation will guard its national security with full strength and will decisively cut any unclean hand from any part of the globe which tries to harm it," Ahmadinejad said in a message broadcast on state television.
Ahmadinejad said that his re-election in June 2009 was a 'true' example of democracy for the world.
"The decisive vote by the nation for the president clearly outlined what path the government should take," said Ahmadinejad, whose win has sparked one of Iran's worst political crises with the opposition charging it was rigged.
"The enemy tried to hide the success of the Iranian people with dust, but in reality they were rubbing their own faces with dust ... They should know that the Iranian nation is more determined than last year to pursue its high goals," he said.
The President's statement came after the US President Barack Obama said that US would continue to work for the safe and secure future for the people of Iran.
Iran will celebrate New Year on Sunday, Mar 21.