"In negotiations at the WTO, if there are efforts to be made, then let everyone make them. Right now, I do do not see what efforts the United States are prepared to make," Sarkozy told a group of farmers in northern France.
"If that is not understood at the WTO negotiating table, France will use its veto," he said, also calling on Brazil and India to come forward with concessions.
"I am totally determined to defend agriculture as an element of our country's strategic economic power," Sarkozy said, assuring the gathering that "agriculture has a future".
He said: "I am not prepared to swap agriculture for services, within the framework of the WTO. We cannot keep on negotiating like this."
The current round of WTO talks on trade liberalisation, launched in 2001 but suspended in July 2006, has foundered largely over the issue of farming, as members fail to narrow their differences on issues such as generous European Union and US farming subsidies.
The four key WTO players -- the United States, the European Union, Brazil and India -- have pledged to redouble their efforts to reach their own agreement by mid-June.
They are scheduled to meet in London on 10th June, and hold another meeting between 14th and 19th June.
Under former president Jacques Chirac, France -- Europe's biggest agriculture power -- fought fiercely against making major concessions at the WTO on opening up Europe's agriculture markets to foreign competition.
Sarkozy, speaking last week in Brussels, said that an agreement at the WTO would be better than a disagreement, but that others needed to make more concessions.- DDNews India