This is really bad for Putin. He now has an eight hundred mile border in northern Russia which is now not neutral but NATO. Changes dramatically any calculation he might have about attacking the west. And the Baltic Sea is now a NATO lake.

While we're talking about Russia worth mentioning that it's actually profitable in the long term for America to be supporting Ukraine. A lot of the billions of dollars of weapons they're sending are existing stuff that would never be used/is being phased out/replaced/mothballed and so on. The rest of it just goes on the national debt which eventually melts away to nothing with the passage of time. Really all the US is looking at even if it continues to fund Ukraine for a few more years is interest on the bonds it sells to finance this. Back of the envelope says thirty or forty billion in nominal dollars but that's thirty to forty in 2080ish money so around ten in real money over time.

This buys America insurance on its trade with Europe, currently over a trillion dollars a year. That's insuring trade isn't disrupted with a Europe suddenly at war which would cost hundreds of billions of losses, job losses and so on for America Inc. And when the war is over and Ukraine gets some kind of NATO protection it then gets a credit rating which will result in a trillion plus dollars of investment pouring in, a lot of which will be American on the back of massive Ukrainian goodwill to America for helping it out. That will result in many hundreds of billions of dollars heading back to American businesses and tens of billions in extra government revenue.