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NATO has been on high alert since Russia invaded Ukraine more than three and a half years ago, but a recent spike in the alliance’s airspace violations has security experts increasingly concerned that warnings of war with Moscow are no longer theoretical, but inevitable.

President Donald Trump on Thursday said the U.S. could “end up in World War III” over Russia’s war in Ukraine and conceded that Russian President Vladimir Putin has “let him down” over his refusal to end his military campaign.

One day later, Russia sent three fighter jets over Estonia’s capital city of Tallinn in a direct and clear violation of its airspace, prompting another NATO member to spark Article 4 for the second time in as many weeks.

RUSSIAN JETS VIOLATE ESTONIAN AI

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