I think some folks have a different view of diplomacy than what the actual situation is. ..And of course, the popular media does nothing to clarify misunderstandings.
The meeting in Alaska, was simply to prepare the ground for a meeting between Putin and Zelensky. The Pres couldn't make any deal for

Zelensky, only Zelensky can do that !
So far as this initial meeting went, it was a huge success..especially for Pres Trump and the USA. The normally intangibles made great strides..
This may sound juvenile, but initial impressions go far, not only for the masses of people, but in a subtle way, for national leaders too !
Take a look !
Both planes land..Air force One seems to loom larger than it's Russian counterpart! Then as Putin joins the president on the red carpet, while Pres trump manages the "Alpha handshake"..
Then they turn and walk down the carpet, between the noses of 2 lines of F-35s..likely the world's technically superior fighters..
They barely pass the F35s, when a B2 bomber flies over with a fighter escort...a reminder of the destruction in a few minutes, of the nuclear industry of Iran.
...But the biggest news of it all, is Putin's admission that had Trump been president when the Ukraine war started, Putin would never have started the war..
Just as Trump has been saying.. You need only watch the first 1.5 minutes of this video, and listen to the interpreter;
https://www.youtube.com/watch?v=DdzvNCJVxD4 Or here if you prefer..the interpretation posted across the bottom..
https://www.youtube.com/watch?v=5qpTQAh1mV8