Senate Foreign Relations Cmte Chair Robert Menendez on what he says is 'clearly an invasion' of Ukraine by Russia.
White House Deputy National Security Adviser Ben Rhodes on U.S. plans to help Ukraine and stiffer sanctions against Russia.
U.S. Secretary of State John Kerry says "drunken separatists" are interfering with the MH17 investigation. Kerry also demanded Russia to "step up, publicly" and join the search for the truth.
Rep. Eliot Engel and Sen. Ron Johnson on the escalating crisis in Ukraine. Are sanctions working or should we provide weapons?
By CNN's Susan Garraty
In the continuing effort to get at Russian President Vladimir Putin where it hurts the most, the White House is encouraging US business leaders to withdraw from planned participation in the St. Petersburg International Economic Forum to be held later this month in Russia.
White House spokesperson Caitlin Hayden tells CNN's State of the Union that participating in the forum is a choice for American businesses, but the Obama administration is letting companies know it takes a dim view of those who choose to go to St. Petersburg while the crisis in Ukraine continues and economic sanctions are in place.
Former Director of National Intelligence, John Negroponte, and Washington Post columnist David Ignatius talk to Candy Crowley about the implications of the crisis in Ukraine.
Chairman of the Senate Intelligence Committee Sen. Dianne Feinstein (D-California) tells Candy that while she has deep concerns, she has "persuasive hope" that Putin will not invade Ukraine.
Former Secretary of State Madeleine Albright cautions that the US should be more wary of Putin's aggression in Ukraine.