JERUSALEM — Israel's top negotiator warned Wednesday that failure in peace talks could lead to the establishment of a Palestinian state with international backing on terms unfavorable to the Israelis.

"Stalemate can lead to a Palestinian state that would be forced on us — not as the outcome of negotiations that represent the Israeli interest," Justice Minister Tzipi Livni, who heads Israel's negotiators at peace talks, told a meeting of the World Jewish Congress in Jerusalem.

"When there is no peace process, there is no legitimacy to act in order to keep Israel's security. So stalemate is against Israel's security needs," she said in a recording released by organizers.

"I believe in the peace process not as a favor to Europe or to the United States of America. It is our own interest," Livni said.

Livni added while Israel has a strong military, continued U.S. support was also vital for the Jewish state.

"Security is guaranteed by more than just militaries. Our security is also guaranteed by our relationship with the USA," Livni's spokeswoman quoted her as telling the congress.

Monday's session was attended by Livni and Palestinian negotiators Mohammed Shtayeh and Saeb Erakat, the official said.

The official did not give further details, but the question of water rights is one of the core issues that must be settled in any peace deal.

Israel controls most of the underground water resources in the West Bank, and the Palestinians want a more equitable share of them.

Kerry said on Monday that negotiations, which take place under an American-imposed media blackout, have "intensified."

Speaking in Paris, Kerry said that since the end of July, 13 direct meetings had taken place, including three in the past four days.

"The pace has intensified, all the core issues are on the table and they have been meeting with increased intensity," Kerry said.

"It is no secret to anybody that this is and remains a difficult process, there is no shortage of passionate skeptics," he added.