BRUSSELS — NATO appointed Mark Rutte as its next secretary-general on Wednesday, putting the outgoing Dutch prime minister in charge of the world’s biggest security organization at a critical time for European security as war rages in Ukraine.

Rutte’s appointment was sealed by NATO ambassadors during a meeting at the 32-nation alliance’s headquarters in Brussels. U.S. President Joe Biden and his counterparts will formally welcome him to their table at a summit in Washington on July 9-11.

The outgoing Dutch premier will take over from the current secretary general, Norway’s Jens Stoltenberg, on Oct. 1. Stoltenberg spent more than a decade at the helm. His mandate was repeatedly extended, in part to provide continuity after Russia invaded Ukraine in 2022.

Suffolk County Sheriff Errol Toulon Jr. spoke with NewsdayTV's Ken Buffa about what life is like for the Gilgo Beach serial killer Rex Heuermann in jail. Credit: Anthony Florio; File Footage; Photo Credit: Newsday / James Carbone, John Paraskevas; AP / David Bookstaver, Clark County Sheriff's Office, Richard Drew, Mitchell Tapper, Don Ryan; Peconic River Sportsman’s Club / Kerry Goldberg

'He will be ... coming out of prison in a body bag' Suffolk County Sheriff Errol Toulon Jr. spoke with NewsdayTV's Ken Buffa about what life is like for the Gilgo Beach serial killer Rex Heuermann in jail.

Suffolk County Sheriff Errol Toulon Jr. spoke with NewsdayTV's Ken Buffa about what life is like for the Gilgo Beach serial killer Rex Heuermann in jail. Credit: Anthony Florio; File Footage; Photo Credit: Newsday / James Carbone, John Paraskevas; AP / David Bookstaver, Clark County Sheriff's Office, Richard Drew, Mitchell Tapper, Don Ryan; Peconic River Sportsman’s Club / Kerry Goldberg

'He will be ... coming out of prison in a body bag' Suffolk County Sheriff Errol Toulon Jr. spoke with NewsdayTV's Ken Buffa about what life is like for the Gilgo Beach serial killer Rex Heuermann in jail.

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