In May 2025, the multinational field exercise Hedgehog 2025 (also known as Siil 2025 in Estonia) brought together more than 16 000 personnel from 12 member states of the North Atlantic Treaty Organisation. With scenarios centered on a simulated incursion across Estonia’s eastern border, the drills were intended to test European deterrence and defense concepts under high pressure (Defence24.com, 17.02.2026).
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