The consensus on this forum seems to be that Biden's decision to allow Ukraine to use longer range weapons is a deliberate attempt to disrupt whatever strategy Trump wants to put in place once he has power. I don't agree.
There is another equally plausible explanation - he is doing it to support Trumps initiatives.
To bring conflict to a swift end requires:
- Putin to believe that he has won - winning permanent border changes enlarging Russian territory. It is a victory justifying the losses and sacrifices sustained by the Russian people.
- Zelensky needs to bring the conflict to a close with dignity. There is zero chance of Ukraine defeating of Russia. Conflict is only sustained through Western supplies of military hardware, without which rapid defeat by a numerically superior enemy would quickly follow.
The Trump strategy - force agreement to a ceasefire and revised borders:
- Putin carrot - gets enlarged territory - borders - Crimea is already a de facto done deal + Eastern Ukraine largely held by Russia now
- Putin stick - all limits removed from US sourced weapons + increased supply of munitions
- Zelensky carrot - probable membership (there will be some hurdles) of NATO and/or EU - future security for the core of Ukraine
- Zelensky stick - no more munitions - defeat looms large
Bidens initial act is just a warning to Putin - I suspect they have much more potent weapons in their arsenal and the capacity to reach Moscow if wanted.
If the Trump initiative is success he can claim to have laid the groundwork, if Trump fails he can at least claim they tried. He may even have agreed their use with Trump, or at the very least denied Trump the egotistical kudos of claiming "I did it, Biden was a hopeless POTUS