So possible options as I see them:

1. Biden's USA is stubborn and nihilistic and just wants to kill as many Ukrainians and Russians as possible before Trump comes in and forces Ukraine to accept a treaty

2. USA (and Ukraine) knows that Putin hasn't changed its demands at all so any talks are pointless

3. USA (and Ukraine) knows that Russia is losing and doesn't want to negotiate

4. Biden forgot how to use a phone and is too embarrased to ask

I'm personally going with 2 with a sprinkle of 4 and 1. In my happy dreams, 3.

Update: it would seem that people disagree with me, fair enough, but perhaps somebody would care to tell me what is wrong with my theory?

Original comment:
I'm going to try with a crazy conspiracy theory(but the crazy ones are the more entertaining ones, right?):

Putin's investment in the western defense industry drove the invasion of Ukraine to stimulate European NATO countries' military investments.

Reasoning:

1. Russia's actions towards Eastern NATO countries and the invasion of Ukraine could be strategic moves to encourage European NATO nations to bolster their military investments.
2. Sweden and Finland's potential NATO membership could further incentivize their procurement of NATO-aligned weaponry.
3. Other Western European countries are already allocating significant resources to military investments.

Considering Occam's razor, is it simpler to assume Putin, heavily invested in the defense industry, initiated conflict for profit, or believe in complex internal political motives?