Excluded from Friday's summit, Ukrainian President Volodymyr Zelenskyy said ahead of Trump and Putin's meeting that he is counting on the United States.

"Today, I also expect a report from our intelligence on the current intentions of the Russian side and its preparations for the meeting in Alaska. Indeed, high stakes," Zelenskyy said. "The key thing is that this meeting should open up a real path toward a just peace and a substantive discussion between leaders in a trilateral format -- Ukraine, the United States, and the Russian side. It is time to end the war, and the necessary steps must be taken by Russia. We are counting on America. We are ready, as always, to work as productively as possible."

President Donald Trump told ABC News Senior Political Correspondent Rachel Scott he's going to talk with Vladimir Putin about Russia's overnight strikes during Friday's meeting. Trump said he believed the strikes hurt the Russian leader ahead of their talks.

"I think they're trying to negotiate. He's trying to set a stage. I mean, in his mind, that helps him make a better deal. It actually hurts him. But in his mind, that helps him make a better deal, if they could continue the killing. Maybe it's a part of the world, Maybe it's just his fabric, his genes, his genetics, but he thinks that makes him, gives him strength in negotiating. I think it hurts him, but I'll be talking to him about it later," Trump said aboard Air Force One.

Russia attacked Ukraine with two ballistic missiles and 97 drones, the Ukrainian Air Force said on Friday morning.

Joining President Donald Trump at the summit are Defense Secretary Pete Hegseth as well as Gen. Dan Caine, the president's top military adviser, and Gen. Alexus Grynkewich, the top NATO and U.S. commander in Europe.

Grynkewich has been playing a lead role in orchestrating new military aid for Ukraine, including an initial aid package now totaling $1.5 billion.

Under the plan endorsed by Trump, five European allies -- the Netherlands, Norway, Denmark, Sweden and Germany -- have agreed to purchase air defense capabilities, missiles, artillery and ammunition from U.S. companies. The weapons would then be provided to Ukraine. A senior NATO military official said to expect "further significant announcements from other allies soon."

Officials said Grynkewich and Caine, who is chairman of the Joint Chiefs, will be on hand at the summit to provide Hegseth and the president military advice.

-ABC News' Anne Flaherty

President Donald Trump on Air Force One said the U.S., in conjunction with Europe, could "maybe" provide security guarantees to Ukraine. Security guarantees post-war are a key demand of Ukrainian President Volodymyr Zelenskyy.

“Maybe, along with Europe and other countries. Not in the form of NATO, because that's not going to, you know, there are certain things that aren't going to happen. But, yeah, along with Europe, there's a possibility of that," Trump said.

-ABC News' Fritz Farrow