I hate break it to anyone who thinks this will be perceived as some kind of massive fuck up on Biden's part: This is literally the first time this administration has set a policy and not fucked it up.
A lot of people, including myself, believe that this would never have happened with Trump in charge because He would have made a show of force as soon as it seemed likely that something like this was going to happen. He would probably have announced on twitter that He was designating the separatist leaders as terrorists and that He intended to send aircraft over eastern Ukraine to target them and their military infrastructure, daring Russia to attack and start a war with the US.
But hypotheticals like that don't change the fact that the Biden administration has been perfectly consistent in their messaging regarding whats been happening with Russia and Ukraine for the last couple months and what the American response would/wouldn't be if the predictions turned out true.
I've been forced to watch MSM coverage of this shit since the beginning because of the unfortunate politics of my loved ones and I can tell you the messaging has been consistent and simple:
1: Russia has mobilized an enormous military force positioned around Ukraine, including in Belarus, that could likely blitz the rebel territory if not the whole country on a moments notice and there are subtle signs this might not be feint.
2: If an attack happens the US/NATO will not commit any troops to support Ukraine nor any other support that puts personnel in direct conflict with Russian/Belorussian forces and will evacuate military/government personnel if it happens.
3: The US will supplement NATO forces in territory its obligated to defend should this attack, if it does happen, leads to something bigger.
4: If an attack happens the US and its allies will work to implement unspecified economic measures, clearly hinting at an Iranian style blacklisting of vast sections of the Russian economy.
And that's it, that was their stated policy on this matter and I've seen no indications they're deviating from it. The glowies were correct, and every European leader who advocated a soft approach with Russia and downplayed these warnings are eating shit right now, Biden and Boris are looking golden by comparison.