At present, I disagree that Putin would, or even could, attack a NATO country. Putin is at the limit of his military resources just trying to hold A PORTION OF Ukraine. Putin can level cities with artillery from a distance, but his forces are incapable of occupying or holding Ukrainian cities. And his forces are taking devastating losses, in a relatively short period of 4 months so far, last I heard about 30,000 dead Russian soldiers (and Ukraine is taking equally high losses). Even if Putin were humiliatingly defeated, if he survived and remained in power, he could spend several years rebuilding militarily, and attack Ukraine or elsewhere again. Although if the defeat were humiliating and destructive enough, Putin would lose power or be killed, and cease to be a future threat.
But whether Putin is offered "an off-ramp" to avoid humiliation, or if Russia were thoroughly and humiliatingly defeated in Ukraine, either way he can rebuild, possibly learn from his mistakes how to be militarily more formidable, and strike again after a few years of re-armament.
Either way, the greater direct threat to the U.S. is China, and Biden's policy, rather than diplomatically separating Russia and China, has driven them together, along with Iran and North Korea. So Biden has done the opposite of good foreign policy, the opposite of protecting the United States.
President Trump demonstrated how well a president can use soft power, to avoid a costly war. Whereas the establishment, both Democrats and RINO Republicans, want to turn Ukraine into another 20-year war like Afghanistan or Iraq. A war Trump would have deterred if he were still president, before the conditions to provoke war could even begin. Trump won and ended existing wars, and prevented others from ever happening. In Korea and Iran, and deterred hostilities between the U.S. with Russia and China. For which George Orwell's liberal media gave him absolutely no credit.
