Us army air jet innoculator

A Sukhoi Su-27 fighter jet performs during an aviation show outside Moscow.   (Reuters)

Once alongside, the Russian jet was “provocative” in its flight maneuvers and flying “erratically,” according to another official.

Since June 2 there have been more than 35 interactions in the Baltic Sea region between U.S. and Russian jets and warships, but the incident Monday morning is notable because the U.S. military considered it “unsafe,” according to one official.