Again, it is not the job of the US to be world cop, it goes against the vision of the Founders, it is neocon talk, Putin will not attack a NATO member, that may mean Ukraine falls, and conservatives don’t live or support policies based upon humanitarianism.
From 1945 until the 1990s, the US and allies stood tall against Communist expansionism from the Soviet Union, Communist China and others.
The doctrines then were called "containment" and "MAD" and they prevented a Third World War.
Today, we've largely forgotten about "containment" and "MAD", but neither the Old Soviets (Putin) nor the Chinese Communists (Xi) have forgotten, they see & "smell" our weakness and so are now hoping to do what they couldn't before -- become empires of conquest.
It's exactly the same situation today as the 1930s Rhineland, Austria, Sudetenland & Poland.
Winston Churchill blamed Chamberlain for WWII because, he said, Chamberlain didn't follow Churchill's advice to get tougher on Hitler sooner.
That's where we are today in Georgia, Ukraine, Taiwan & elsewhere.