In May of 2025, NATO ran a major "military exercise" called Hedgehog in Estonia, involving over 16,000 troops from 12 NATO countries. This "wargame" highlighted the critical role of a Ukrainian-Estonian OPFOR unit, leveraging advanced "drones" and the expertise of "Ukraine soldiers" to simulate a mechanized offensive. The "military simulation" demonstrated crucial lessons for the "NATO eastern flank" in a realistic "joint training" scenario.