Dutch PM Mark Rutte
Dutch PM Mark Rutte

Outgoing Dutch Prime Minister Mark Rutte will be NATO's next secretary-general after being selected Wednesday as the successor of Jens Stoltenberg who will leave the position in October following a decade at the helm of the world's largest military alliance.

But with challenges ranging from the war in Ukraine to uncertainty about Washington's position in the alliance and growing tensions with China, the future NATO chief will have his work cut out for him as he takes the reins at a critical juncture for the organization.

“The alliance is and will remain the cornerstone of our collective security,” Rutte said after being appointed following a meeting of the 32-member organization, only days ahead of a key NATO leaders' summit in Washington that will also mark the alliance’s 75th anniversary.

The Dutch leader, who has the backing of the United States and most other big member states, emerged as the sole candidate after his final challenger, Romanian President Klaus Iohannis, dropped out of the race last week.

Hungary also lifted its objections after Rutte pledged that Budapest would not be obligated to send personnel or provide funds for a new Ukraine support plan.

The Dutchman is regarded by many as an experienced statesman and a dedicated Atlanticist. After having led several Dutch coalition governments since 2010, the 57-year-old has accumulated a wealth of experience, diplomatic skills and contacts both in Europe and across the globe.

Those skills are critical for a job that focuses on managing a large organization, explaining NATO to global audiences and building consensus. The latter is particularly important as key decisions require all 32 allies to agree.

“One of Rutte’s strongest arguments in his campaign to secure the job was his record of building effective working relationships with people from across the political spectrum,” said James Black, assistant director of defense at Rand Europe, part of the nonprofit Rand Corp. think tank.

This included charting a way to a pragmatic compromise even with leaders whose politics he may not personally share. He did this not only at home, where he managed difficult political coalitions, but also internationally, where he has been at the forefront of international negotiations on issues such as boosting support for Ukraine.

For Rutte, the road ahead will be fraught with challenges.

With the war in Ukraine raging and Russia making battlefield gains, his immediate priority will be to maintain any momentum coming out of next month’s summit in Washington, particularly in terms of NATO’s growing support for Kyiv, all the while guarding the alliance from a direct confrontation with Moscow.

NATO recently agreed to launch a 700-personnel command center next month in Germany to coordinate international weapons deliveries and training activities, efforts that are also meant to bring Ukraine closer to NATO standards.

The alliance is also considering a long-term financial pledge of at least €40 billion ($42.7 billion) per year for Kyiv in a bid to institutionalize long-term support.

As a Dutch leader, Rutte was a fierce critic of Russian President Vladimir Putin and a staunch supporter of Kyiv, so there is every expectation that this will continue in his new role.

However, it is unclear whether Rutte’s tenure will eventually see Ukraine joining the alliance, given the many practical and political barriers. Nevertheless, there is growing recognition within the organization of the need to match NATO’s rhetoric with more concrete actions.

There is increasing talk of building a “bridge” to Ukraine’s NATO membership, with the hope being that more details will soon emerge “on the conditions under which such membership might occur and the practical steps to speed that along,” Black said.

Such an endeavor would be in line with a nonbinding, 10-year security agreement Washington and Kyiv signed two weeks ago that saw the two pledge to advance reforms needed for Ukraine’s accession to both NATO and the European Union.

Meanwhile, Rutte will have to ensure that previously agreed initiatives are implemented, including those meant to boost defense technology innovation, deepen ties with Indo-Pacific countries, and ramp up military spending and production.

These issues remain critical as the alliance faces a rapidly changing set of global strategic challenges, including its potential role in the growing Sino-U.S. rivalry.

“Rutte will have to make sure that NATO is ready for war and willing to step up cooperation with the EU on common interests such as Ukraine support and defense production,” said Jamie Shea, a former NATO deputy assistant secretary-general for emergency security challenges.

Arguably his greatest challenge in this regard will be maintaining U.S. support amid concerns about a lapse in Washington's commitment should former U.S. President Donald Trump, who has fiercely