The senator said Russia could march further into Ukraine unless stopped.
The simultaneous push could make it more difficult for the Obama administration to ignore the issue as it pursues a nuclear deal.
Russia's claims it entered Crimea to help ethnic Russians drew scorn from U.S. officials.
The White House has said a "zero enrichment" option is unrealistic.
The House returns after a snowstorm gave members a day off — today, they'll work on up to eight suspension bills to make up for lost time.
The guarantees would help Ukrainians who could see the loss of Russian energy subsidies.
The former ambassador called Putin’s decision to invade Crimea an “emotional reaction."
Putin said the ousting of Ukraine's president was an “unconstitutional coup.”
Putin responded on Tuesday morning, blaming a coup in Ukraine for causing instability, fear.
Netanyahu said Palestinians haven't done their part for peace.