Briefing #1: NATO's New Operation Eastern SentryWhat You Need To Know: Two days after an unprecedented drone incursion by Russia on Polish territory on September 10, NATO unveiled its response: Operation Eastern Sentry. Eight countries have already joined Eastern Sentry and placed assets at the disposal of NATO's supreme allied commander (SACEUR) Alexus Grynkewich. First, the lack of any new American assets being provided to Eastern Sentry so far. The second issue is that the commitment to Eastern Sentry has so far been very focused on expensive fighter jets and other costly equipment. As Grynkewich put it when pressed by the media after unveiling Eastern Sentry: "It's time to take a fresh look at this.