Gusmao said Australia was "using all the dirty tactics it can" to prevent East Timor from obtaining exploration rights to what he estimated was up to 5bn pounds worth of oil.
"They steal from us and then they hold conferences about transparency, anti-corruption," he reportedly said.
Australia has accused East Timor of trying to whip up sympathy and controversy while negotiations continue between the two neighbours on a maritime boundary.
East Timor has criticized Australia's refusal to take the dispute to an international court.
