Ukraine hit a Moscow oil refinery for a second time in a week and disrupted commercial flights at Moscow airports in one of its biggest drone attacks since Russia's invasion more than four years ago, Russian officials said Thursday.

The Russian Defense Ministry said that its air defenses overnight shot down 555 Ukrainian drones over multiple regions, with almost 200 intercepted as they were approaching the Russian capital.

Below is the full text of the U.S.-Iran memorandum of understanding, as delivered by a senior U.S. administration official in a briefing with reporters:

(Because the official read the deal to reporters and the print text has not been released, this transcript may be inexact, for example in terms of punctuation.)

U.S. President Donald Trump said Wednesday he expected the accord with Iran ending the Middle East war to be signed "shortly" but cast uncertainty over the exact date.

Tehran's foreign ministry on Wednesday said it was considering a plan for the presidents of the U.S. and Iran to sign the deal ending the Middle East war, ahead of the expected ceremony in Switzerland.

Germany and Poland are set to sign a new defense agreement on Wednesday, putting aside their complicated past to strengthen European military cooperation amid heightened tensions with Russia and growing uncertainty over U.S. engagement in Europe.

Relations between the two neighbors in recent years have become more pragmatic in the wake of Russia's full‑scale war on Ukraine in 2022 and the coming to power of a liberal government in Poland in 2023.

UK Prime Minister Keir Starmer on Wednesday accused the crew of a Russian warship of acting recklessly when they fired warning shots near a British yacht in the English Channel, though he downplayed the seriousness of the incident.

The owners of the 40-foot (12-meter) sailboat Bright Future say the shots were fired early Tuesday morning when they encountered a Russian warship while crossing the English Channel to Cherbourg in France. Russia says the crew of the frigate Admiral Grigorovich fired shots into the air after the sailboat failed to respond to warnings to change course.

Leaders at the Group of Seven summit on Wednesday threw their support behind U.S. President Donald Trump's tentative agreement with Iran to open the Strait of Hormuz and further extend a shaky ceasefire — even though he's offered scant specificity about how that would be implemented.

In a declaration issued overnight, the leaders called the deal a "historic opportunity to prevent Iran from acquiring any nuclear weapon and tackling the threats related to its regional and ballistic activities." The leaders said that they were "ready to contribute to its implementation," although neither the White House nor Iran has released the text of the agreement.

Iran's Foreign Minister Abbas Araghchi said on Tuesday that ending the war on all fronts, including Lebanon, was "the most important" issue in the peace deal with the United States announced the day before.

Iran's top negotiator Mohammad Bagher Ghalibaf will attend the signing in Switzerland of the deal ending the war with the United States, an Iranian deputy foreign minister said on Tuesday.

U.S. President Donald Trump said on Monday the Strait of Hormuz would be fully open later in the week, after Washington and Tehran announced a deal to end the Middle East war.