NATO has promised a "robust" response after Russia sent three fighter jets into Estonia's airspace without permission.
It stated: "The North Atlantic Council met this morning at the request of Estonia, under Article 4 of the Washington Treaty, to consult and strongly condemn Russia’s dangerous violation of Estonian airspace on 19 September."
And it continued: "NATO’s response to Russia's reckless actions will continue to be robust. On 12 September, we launched “Eastern Sentry” to bolster NATO’s posture along the entire Eastern flank. We will reinforce our capabilities and strengthen our deterrence and defence posture, including through effective air defence.
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"Russia should be in no doubt: NATO and Allies will employ, in accordance with international law, all necessary military and non-military tools to defend ourselves and deter all threats from all directions. We will continue to respond in the manner, timing, and domain of our choosing. Our commitment to Article 5 is ironclad."
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