The United States announced Tuesday it will impose new sanctions targeting Iran in the coming days following its "unprecedented air attack against Israel."

The sanctions include targeting Iran's missile and drone program and new sanctions against entities supporting the Islamic Revolutionary Guard Corps and Iran’s Defense Ministry, according to the White House's national security adviser, Jake Sullivan.

"We anticipate that our allies and partners will soon be following with their own sanctions,” Sullivan said in a statement. "We will not hesitate to continue to take action, in coordination with allies and partners around the world, and with Congress, to hold the Iranian government accountable for its malicious and destabilizing actions."

The U.S. is telegraphing its sanction plan in advance to underscore the large international response that the U.S. is coordinating and to signal to Iran there will be diplomatic costs to what they've done, a senior administration official told ABC News. The official said they believe this will have an impact, in part, by bringing other countries on board.

-ABC News' Selina Wang

Six months into the Israel-Hamas conflict, the conduct and ethics of some Israel Defense Forces members have increasingly come under the microscope.

Incidents ranging from pranks to potentially criminal acts are being exposed to the world, often by videos soldiers themselves have posted online, according to critics and Israeli officials.

In many pictures and videos that have circulated since the conflict began, and which were reposted by pro-Palestinian activists to millions of followers, IDF soldiers are seen blowing up buildings in Gaza while in combat, waving women’s underwear like flags and rifling through the possessions of Gazans with gleeful expressions.

Younis Tirawi, a Palestinian activist, says he’s seen thousands of videos of IDF soldiers reportedly behaving improperly.

"You can see all the soldiers liking their posts," Tirawi told ABC News.

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Secretary of State Antony Blinken spoke with Israeli war cabinet minister Benny Gantz, during which Blinken "continue[d] to send the same messages in all his conversations -- which is we do not want to see further escalation of the conflict," according to spokesperson Matt Miller.

Miller declined to say whether the U.S. assessed the threat of escalation had fallen, but an administration official said the amount of time that has already elapsed since Iran’s weekend attack had boosted hopes that Israel would exercise constraint.

Miller batted down reports that Iran and the U.S. were communicating through intermediaries in the wake of Tehran’s attack on Israel.

"There have not been such messages delivered. It's been days since we've communicated -- since we've sent messages to the government of Iran," Miller said. "And I say that as a reminder of something we've said before: Oftentimes, the Iranian government has misled the world about either messages they've passed to us or messages that we have passed to them."

-ABC News’ Shannon Crawford

U.K. Prime Minister Rishi Sunak spoke on the phone with Israeli Prime Minister Benjamin Netanyahu on Tuesday. While Netanyahu thanked Sunak for the U.K.'s support to counter Iran's weekend attack on Israel, Sunak also had harsh words for Netanyahu about the deepening humanitarian crisis in Gaza.

"On Gaza, the Prime Minister said he remained gravely concerned about the deepening humanitarian crisis," a Downing Street spokesperson said. "The U.K. wanted to see a massive step change in aid access to flood Gaza with vital supplies, including Israel opening up new aid routes as quickly as possible. The Prime Minister said it was deeply disappointing that Hamas blocked a deal at the weekend that would have saved Palestinian lives and secured the safe release of hostages."

An Israeli military source told ABC News that Iran has targeted military sites only -- civilian sites were not targeted.

The Israel Defense Forces also moved up its arrival estimate: The first drones will close in on Israel an hour earlier than expected, at 1 a.m. local time, 6 p.m. ET.