Mr. Stoltenberg’s visit was not previously announced, a practice that, because of security concerns, is common for top international officials making trips to Ukraine.

Mr. Stoltenberg also praised Mr. Biden for a new $325 million aid package that was announced on Tuesday for munitions, weapons and equipment for Ukraine.

Mr. Stoltenberg called Mr. Rutte a “true trans-Atlanticist, a strong leader and a consensus-builder.” “I wish him every success as we continue to strengthen NATO.

Supporting Ukraine in its war against Russia may be top of the agenda for this week’s NATO summit in Washington, but Secretary-General Jens Stoltenberg said the alliance isn’t ignoring its own ...

But Mr. Stoltenberg said such plans were vital to ensure Ukraine would continue to receive enduring NATO support rather than piecemeal donations.

The statement said Mr. Erdogan met on Monday with Mr. Stoltenberg and Prime Minister Ulf Kristersson of Sweden to discuss the country’s bid, which had been held up by Turkey’s demands that ...

Mr. Stoltenberg said that “strong support” from 29 of the 31 ministers sent “a very clear message” to Turkey for Sweden’s speedy membership.

“As Ukraine continues its vital reforms, we will continue to support them on the irreversible path to NATO membership,” Mr. Stoltenberg said after a day of meetings with President Biden and ...

Still, Mr. Stoltenberg expressed optimism that Sweden, having met Turkey’s demands to toughen up its terrorism laws, will become a member by the meeting in Vilnius or soon afterward.

In a hastily convened press conference late on Friday, the NATO secretary general, Jens Stoltenberg, made clear the military alliance’s support for Ukraine as the war enters a critical inflection ...

NATO Secretary-General Jens Stoltenberg on Friday said the alliance must focus on climate change even as it contends with fortifying its defenses against aggression from the Kremlin.

When asked Sunday of his personal assessment of Mr. Biden as an effective leader, Stoltenberg said their conversation was a positive one. "We had a good-we had a productive meeting.