COPENHAGEN — Casper Klynge, a career diplomat from Denmark, has worked in some of the world’s most turbulent places. He once spent 18 months embroiled in reconstruction efforts in Afghanistan. For two years, he led a crisis management mission in Kosovo.

Yet Mr. Klynge, 46, says his toughest foreign posting may be the one he has now: as the world’s first foreign ambassador to the technology industry.

In 2017, Denmark became the first nation to formally create a diplomatic post to represent its interests before companies such as Facebook and Google. After Denmark determined that tech behemoths now have as much power as many governments — if not more — Mr. Klynge was sent to Silicon Valley.

“What has the biggest impact on daily society? A country in southern Europe, or in Southeast Asia, or Latin America, or would it be the big technology platforms?” Mr. Klynge said in an interview last month at a cafe in central Copenhagen during an annual meeting of Denmark’s diplomatic corps. “Our values, our institutions, democracy, human rights, in my view, are being challenged right now because of the emergence of new technologies.”