Russia jets entered Estonian airspace in an incident Western officials say was to test NATO. Photo: EPA PHOTO

NATO has condemned Russia for violating Estonian airspace and says it will use "all necessary military and non-military tools to defend ourselves" as it faces "a pattern of increasingly irresponsible behaviour" by Moscow.

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Estonia said on Friday that three Russian MiG-31 fighter jets violated its airspace for 12 minutes before being escorted out by NATO Italian fighter jets - an incident Western officials say was likely designed to test NATO's readiness and resolve.

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