VIENNA — Joint efforts by Secretary of State John Kerry and three other Western foreign ministers failed Sunday to advance faltering nuclear talks with Iran, with the target date for a deal only a week away.

“There has been no breakthrough today,” British Foreign Secretary William Hague said after meetings with Kerry and the foreign ministers of France, Germany and Iran.

The trip gave Kerry a chance to ease an espionage dispute with Germany. After meeting with German Foreign Minister Frank-Walter Steinmeier, both stressed the importance of their cooperation in solving global crises, yet offered little indication they have fully mended ties.

Separately, Kerry spoke by telephone with Israeli Prime Minister Benjamin Netanyahu about the escalating Mideast violence. Like the others, he also met with Iranian Foreign Minister Mohammad Javad Zarif.

“We’re working, we’re working, we just got here,” Kerry said, chiding reporters asking about progress as Sunday’s meetings wound down.

But the dispute over Iran’s enrichment program appeared to be defying the Western foreign ministers’ combined diplomatic muscle.

Tehran says it needs to expand enrichment to make reactor fuel but the United States fears Tehran could steer the activity toward manufacturing the core of nuclear missiles. The United States wants deep enrichment cuts; Iran wants to greatly expand enrichment.

Steinmeier and French Foreign Minister Laurent Fabius left Sunday, a few hours after they arrived.

Kerry und Hague stayed on for another day of diplomacy. Still, the dispute and other differences strongly indicated that six world powers and Tehran will need to continue negotiations until July 20 and could decide to extend their talks past that informal deadline for a deal.

Such an agreement would buy time to negotiate a pact limiting the scope of such programs in exchange for a full end to nuclear-related sanctions against Tehran.