Inside NATO's 'Sentry' missions and the urgent drive to ready for new threats

A British Voyager tanker aircraft refuels fighter jets during a November 2025 mission in support of Eastern Sentry. Jake Epstein/Business Insider NATO has rolled out three "Sentry" missions across Europe and the Arctic since early 2025. They follow warnings about inadequate defenses and reflect a push to prepare for new threats. Business Insider went inside all three over the past year to see it firsthand. NATO has rolled out new "Sentry" missions aimed at strengthening defenses across east...