Israel-Gaza-Lebanon live updates: Biden calls Sinwar killing 'a moment of justice'

President Joe Biden is now on his way back to the U.S. after wrapping his day in Berlin meeting with Quad leaders, saying there is a “possibility” of working toward a cease-fire in both Lebanon and Gaza.

"We think there is a road to peace there,” Biden said before boarding Air Force One in Berlin, but cautioned that "it's going to be harder, it's going to be difficult."

"There's an opportunity, in my view, and my colleagues agree, that we can probably deal with Israel and Iran in a way that is -- ends the conflict for a while."

He said there’s also a "possibility of working towards a cease-fire in Lebanon," but it will be "harder in Gaza."

Biden also said he understands what Israel will do regarding a retaliatory strike against Iran and when they will respond, though he did not reveal any of the options or timing.

A reporter asked, "Do you have a good understanding right now what Israel is going to do in response to Iran's Oct. 1 attacks and when they will actually respond to Iran?"

"Yes and yes," Biden said.

-ABC News' Justin Ryan Gomez

National security communications adviser John Kirby called Hamas leader Yahya Sinwar’s death an "inflection point" in this war, providing a new opportunity to reach a cease-fire deal.

"So Hamas is in a much, much, much weakened position than it ever was before," Kirby told reporters in Berlin, where he is visiting alongside Joe Biden. "The president believes that certainly with Sinwar's killing yesterday, that there's a unique opportunity here for us all to kind of grab hold of to see what we can do to end the war and to get a cease-fire. And we still believe that a cease-fire, actually in the north too, but we still believe a cease-fire is important for Gaza to get those hostages home."

When pressed by reporters on what makes the White House so confident that Sinwar's death truly does open the door to achieve a deal that had not been possible for months, Kirby said that it's a "unique opportunity" to take the intensive diplomacy to the next level. Kirby also explained why it was difficult to negotiate with Sinwar.

"Every time his political advisers would -- we would negotiate with and through them to come up with a proposal, it would have to get to him," Kirby said. "Of course, that took time because of the communications challenges, and then he would just, he would just refute it and refuse to move forward."

-ABC News' Michelle Stoddart

President Joe Biden met with German Chancellor Olaf Scholz on Friday afternoon to discuss the war in Ukraine and security threats in the Middle East.

Ahead of that meeting, Biden called Israel’s killing of Yahya Sinwar "a moment of justice."

"He had the blood of Americans, and Israelis, Palestinians and Germans, and so many others, on his hands," Biden said. "I told the prime minister of Israel yesterday, let's also make this moment an opportunity to seek a path to peace, a better future in Gaza without Hamas."

-ABC News' Justin Ryan Gomez

U.S. Central Command (CENTCOM) chief Gen. Michael Erik Kurilla issued a statement Thursday congratulating the Israel Defense Forces on the killing of Hamas leader Yahya Sinwar.

"U.S. Central Command's support to the Israel Defense Forces remains ironclad," said Kurilla. "Our commitment to countering terrorists throughout the Middle East, with allies and partners, continues to be a top priority. Those who choose the path of terrorism should expect the same fate as Sinwar."

CENTCOM is the combatant command that oversees U.S. missions in the Middle East.

An earlier statement from U.S. Defense Secretary Lloyd Austin called Sinwar’s killing a "major achievement in counterterrorism” and said it provides an opportunity for a lasting cease-fire in the war between Israel and Hamas.

“Our top and most urgent priority is to secure the release of each and every hostage, including our own American citizens," Austin said in a statement. "The hostages should not have to suffer for another hour in the clutches of Hamas and other terrorists. Those who are holding them should release them now."