The White House warned Russia on April 18 that Moscow would face tougher sanctions if it failed to abide by a new international deal on Ukraine or moved to send Russian forces into eastern Ukraine. "Those costs and sanctions could include targeting very significant sectors of the Russian economy," Susan Rice, President Barack Obama's national security adviser, told reporters.
Reuters: US threatens Russia with further sanctions over Ukraine
Susan Rice, President Barack Obama's national security adviser, warned Russia about new sanctions.
