LONDON -- Vaindloo island, a tiny rocky outcrop in the Gulf of Finland, is serving as an unlikely barometer for rising tensions between NATO and Russia. On Sept. 19, three Russian MiG-31 jets entered Estonian -- and therefore NATO -- airspace over Vaindloo, remaining in the airspace for 12 minutes and traveling nearly 125 miles west. An Estonian Defense Ministry spokesperson told ABC News that the September MiG-31 intrusion was "unprecedentedly brazen," but it was far from the first. Italian, Swedish and Finnish fighter jets were all involved in shadowing or intercepting the MiG-31s, the spokesperson said. Vaindloo -- Estonia's most northernmost point -- has an area of just 15 acres, but the uninhabited island sits at a strategic choke point. It is situated in the busy Gulf of Finland, 14

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