TALLINN, Estonia—NATO will issue a joint declaration soon on continuing Russian air incursions, Estonian Defense Minister Hanno Pevkur said Monday, and Estonia hopes it will expand air patrols and other defense measures under the alliance's new Eastern Sentry effort. Pevkur spoke three days after a trio of MiG-31 fighters entered Estonian airspace and were escorted out by NATO jets. Pevkur said NATO decided to escort the jets out of Estonian airspace rather than shoot them down after officials “analyzed what kind of weapon systems they had." We warned you.”Pevkur said Tuesday's announcement will concern adding elements to the Eastern Sentry mission to counter manned aircraft, not just drones. “As far as Eastern Sentry goes, it already takes an expansive approach, one that has shown it can defend NATO.