PARIS, France (CNN) - French President Nicolas Sarkozy said Wednesday he is not satisfied with parts of the draft conclusions for the G-20 summit and may even leave if the results are "less than concrete."
"I will not associate with a summit that is useless," Sarkozy told Europe 1 radio Wednesday morning, a day before he meets other world leaders in London.
If the summit reaches only "false compromises" and nothing concrete, he might leave the summit, Sarkozy said - but he added that it's a step he's reluctant to take, and that he doesn't expect the summit to reach that stage.
"An empty chair would be proof of failure" at the summit, Sarkozy said.
Dozens of world leaders and financial chiefs from the Group of 20 nations are holding a summit Thursday in London. The global monetary crisis is expected to be the central issue.
Sarkozy said "sherpas," or representatives of the various world leaders, have been hammering out the summit's final communique for days. Some ideas are on the table, he said, but there are some items that France and Germany disagree with.
"It doesn't add up," Sarkozy said of the draft communique.
Still, three chapters are certain to be in the final document, Sarkozy said: regulation of the markets, more stimulus packages to put "fuel into the system," and making sure the poorest countries don't have to pay the most to resolve the financial crisis.
Sarkozy spoke at length about tax havens, saying it is a major issue the final communique will have to address. The problem with tax havens is not that they avoid tax, Sarkozy said, but that no one knows the source of the money and to where it goes.
France has already taken some steps to reign in tax havens in Andorra and Monaco and change their tax rules.
The president highlighted the remuneration of traders and hedge fund managers as one problem with the financial system.
"There's no point in continuing with a system that encourages these people to take incredible risk" for financial rewards, he said.
More regulation is also needed to bring "transparency" to credit ratings agencies, he said.
The world financial system has been out of control, he said, and that's why new rules and regulations are needed.
"I know from experience it will be necessary to fight to the end" at the negotiating table," Sarkozy said.
Sarkozy also pushed hard for action at the summit in an op-ed published Thursday in The Washington Post.
"The world expects that we will speed up the reform of the international financial system and rebuild, together, a better-regulated form of capitalism with a greater sense of morality and solidarity," Sarkozy wrote, echoing British Prime Minister Gordon Brown's call Tuesday for a return of values and morals in the financial system.
"This crisis is not a crisis of capitalism but the breakdown of a system that drifted away from capitalism's most fundamental values," Sarkozy wrote.
In the radio interview, Sarkozy also talked about U.S. President Barack Obama, calling him "young and dynamic" with a "fantastic new spirit for the entire world."
But he emphasized that France will not always bow to U.S. pressure on points of disagreement.
"I'm a friend of the U.S., but an independent friend," he said.
Sarkozy indicated that France's recent decision to return to NATO's
military command after more than 40 years was meant to boost European defense and show France is standing with the United States.
He said there are "dozens" of countries in Europe that don't bother to
associate with France because it is perceived to be in opposition to the United States. Rejoining the NATO military command, Sarkozy indicated, may help to change that perception.