Israel has shared intelligence over the past two weeks with the U.S. and several European allies suggesting that Iran is taking technical steps to prepare to enrich uranium to 90% purity — the level needed to produce a nuclear weapon, according to two U.S. sources briefed on the issue. Enriching to 90% would bring Iran closer than ever to the nuclear threshold. The Israeli warnings come as nuclear talks resume in Vienna, with Iran returning to the negotiating table… – Vestnik Kavkaza