The United States positions military assets as Trump warns Iran of possible strikes, Israel expands air operations inside Lebanon, Washington advances nuclear cooperation talks with Saudi Arabia, and Ukrainian authorities investigate an explosion in central Lviv.

US negotiators will meet Iran in Geneva on Friday for a new round of nuclear talks, with significant gaps remaining over enrichment limits and Trump's "zero enrichment" stance.

Iran and the U.S. traded threats and warnings even as negotiators sat down to discuss a deal to avert a war, but Tehran says "we now have a clearer path ahead."

United States negotiators are ready to hold another round of talks with Iran on Friday in Geneva if they receive a detailed Iranian proposal for a nuclear deal in the next 48 hours, Axios reported on Sunday,

Texas Sen. Ted CRuz told FOX News on Thursday night that "it is entirely possible that in the next six months we’ll see regimes fall in Iran, in Venezuela, and in Cuba." "And we could also see governments replace them that want to be friends with the United States of America,

The U.S. ⁠Congress ⁠could vote as soon as ⁠next week on whether to block President Donald Trump's ​ability to strike Iran without lawmakers' approval, as the U.S. military prepares for a ‌potential serious conflict with Iran ‌if diplomatic efforts fail.

President Trump says he hasn't decided whether to attack Iran. While he weighs his options, a military buildup over the past month means the U.S. now has an expansive presence in the region.