Defense Secretary Pete Hegseth said Tuesday that a Russian incursion into NATO airspace is “unacceptable,” only a few days after multiple Russian fighter jets entered Estonian airspace.

“Important call yesterday with my Estonian counterpart @HPevkur,” Hegseth said in a post on the social platform X. “The Russian incursion into Nato airspace is unacceptable. The Department of War stands in solidarity with Estonia and commends the rapid, strong........

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