The two sides play by very different rules in these delicate encounters. NATO ships and aircraft operate under strict rules of engagement, maintaining at least five nautical miles’ distance from Russian ships and aircraft. Russian pilots operate under different rules, or no rules at all. “They don’t care,” one pilot told me. While NATO aircraft fly with their transponders on—deliberately visible to the other side—many Russian aircraft do not. For René, the chopper squadron commander, the dangers of these behaviors and this new threat environment are very real. “I have to be quicker in the air,
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