Assistant secretary of state Roberta Jacobson suggests talks will continue for several weeks after senior US official says ‘quite a few things’ need mendingAmerican and Cuban diplomats have failed to finalize plans to re-open embassies in Havana and Washington, but said on Friday that talks had drawn the countries to their closest point in half a century to normalizing relations.Assistant secretary of state Roberta Jacobson refused to tell reporters what specific disagreements remained, only saying that negotiations were “highly productive” and centered around the embassies.