Sanctions expected to impact Russia's financial, energy and defense sectors.
“Everything is on the table right now," said Ambassador to the EU Anthony Gardner.
Three committee chairmen say sanctions would fulfill strategic U.S. objectives.
344 lawmakers signed a letter asking to sign off on any permanent sanctions relief.
Twenty-six senators introduced a bipartisan bill that would impose new and tougher sanctions.
Russia’s prime minister warned the country's airspace could be closed to airlines.
The move could be retaliation for new Western sanctions.
Putin said the sanctions are driving relations "into a corner."
The Republican Florida governor met with Venezuelan activists on Monday.
Javad Zarif said sanctions have "utterly failed" and not impeded Iran's nuclear ambitions.