I for one have really been enjoying the thaw in the Cold War over the last 25 years. From NPR:

Marine Gen. Joseph Dunford Jr., speaking at his confirmation hearing before the Senate Armed Services Committee, said: “Russia presents the greatest threat to our national security. … If you look at their behavior, it’s nothing short of alarming.”

Dunford, 59, said it would be “reasonable” to send lethal weapons to Ukraine to help it battle Russian-backed rebels. “Frankly, without that kind of support, they are not going to be able to defend themselves against Russian aggression,” he said.

“[If] you want to talk about a nation that could pose an existential threat to the United States, I’d have to point to Russia,” he told senators.