SJB
Biden can only put more steel behind support of Europe to do the right things on tougher sanctions and aid.
It's their front line not his, so can't go rouge in someone elses backyard.
Even Britain in the whole Brexit mess has lost influence, and status if they wanted to.
Money behind very cashed up Brexit campaign, and maybe favors Boris owes ?
Boris leading the free world, not so much.
Biden also has a very divided country to heal as well, another advantage to Putin's disinformation campaign.
Asymmetric warfare that literally pays for itself.
Hopefully USA can put something on table to encourage the transfer of some jets,
and larger ranged weapons systems to Ukraine.
I think Poland put up 2Billion for a US base on their territory but it was turned down in 2018
https://www.politico.eu/article/nato-poland-offers-us-up-to-2-billion-for-permanent-american-military-base/
Though the tortoise like speed of approving spending bills in an emergency, even with cross support.
Gives Putin so much more time, if I can't have it you can have ruins and bill to rebuild, with impoverished population.