The 3-year-old civil war in Syria is already a crisis for neighboring Turkey, a NATO member state. Ukraine is not a NATO member, but it borders four nations that are — Poland, Slovakia, Hungary and Romania.
Russia has made clear it is ready to provide weapons and military equipment to governments across the Mideast that have irked Washington. Russia's permanent seat on the U.N. Security Council gives it veto power over major world deliberations.
"The challenge is, we do need to have some kind of working relationship with Russia?" Rep. Adam Schiff, D-Calif., asked Sunday. "And while we can impose these costs and take these steps, we've got to be mindful of the fact that they can impose their own costs on us."
Kerry appeared Sunday on CBS' "Face the Nation," ABC's "This Week" and NBC's "Meet the Press." Rubio was on NBC, while Graham and Schiff were interviewed on CNN. Kaptur and Burns appeared Monday on CNN.