Envoy cautions more work needed, says Iranian officials still refusing direct contact with US; Israeli officials reportedly disappointed by US stance seeking swift return to accord

Mossad chief, national security adviser head to DC Monday to lobby against US return to nuke deal; IDF chief backs out and delegation delays trip due to security flare-up

US is negotiating with others about rejoining 2015 deal, but has yet to outline what, if anything, it wants to see changed in the pact, or what concessions it may offer

Brett McGurk tells Jewish leaders Washington will not take pressure off until it is clear program will be capped and 'back in a box,' Forward reports

But EU chief negotiator says 'much more hard work' needed to rescue 2015 deal; top Israeli security officials to head to US to lobby for improvements to the pact

But Foreign Ministry spokesman cautions that 'practical solutions are still far away'

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Chinese envoy says sides agreed to 'pick up their pace' in talks to save 2015 deal, and 'work on sanctions-lifting as well as other relevant issues'

However, US president pleased that Tehran still taking part in Vienna talks aimed at finding a way back to nuclear deal

Foreign Minister Gabi Ashkenazi vows to act against Iran after Tehran starts enriching uranium to 60%, a short step before weapons grade material