Vienna ? Iran warned the U.S. and Israel on Monday it will repel any attack — while also tamping down tensions by agreeing to meet with Washington and other world powers more than a year after talks broke down over Tehran’s refusal to curb its nuclear activities.

The U.S., Iran and European Union expressed hope the Oct. 1 talks could lead to substantive negotiations — despite Iranian warnings it would not even discuss meeting U.N. Security Council demands that it freeze uranium enrichment.

But White House spokesman Robert Gibbs said enrichment — which can make both nuclear fuel and fissile warhead material — “would be part of the discussion,” along with Tehran’s “illicit nuclear weapons program.”

The prime minister of Israel, Iran’s most bitter foe, was quoted as urging tougher action, including additional sanctions to cripple Tehran’s economy and turn Iranians against the government.