The United States and its allies should be firm with Russia on Ukraine but should not pick a war, retired Gen. Stanley McChrystal told CNBC on Monday.
Russian President Vladimir Putin is testing the West to see how much he can get away with in Ukraine, the former commander of U.S. and international forces in Afghanistan said in a "Squawk Box" interview.
An agreement has been reached on the delivery of Russian humanitarian aid to eastern Ukraine after talks in Berlin, officials in Moscow said. But there was no deal on a cease-fire between pro-Russia rebels and Ukrainian forces.
"We don't need to pick a fight or a war," the four-star general continued, "but I think if you start to give in—particularly to somebody like Putin—then you're going to have a very bad outcome."