Simulating low altitude ground attacks, military pilots tested communications with ground forces while training for any future real-life operation, hitting targets from the air for the first time ever in Estonia, Ukraine Today reports.

With 300 US army ground staff involved, these are the most substantial U.S.-Estonian joint exercises ever held, coming in the wake of fears that Russia may try to stir up problems in the Baltic region, as it did in the east of Ukraine.

A U.S. Air Force official said that the scale of exercises highlights the United States’ commitment to strengthening ties with European partners.

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