Russia recently threw its support behind Belarusian President Alexander Lukashenko, who is facing international condemnation over the detention of dissident journalist Roman Protasevich.
"Russia only goes as far as we let them," Kallas told CBC News Network's Power & Politics in an exclusive Canadian interview.
"So this is clearly a sign that we have maybe let them go too far."
The 26-year-old Protasevich was pulled off a passenger plane that was forced to land by military jets in Minsk last month.
His arrest has prompted the European Union and other countries like Canada and the U.S. to sanction Belarus.
Russia also has continued its military buildup around its borders. The Russian military says it will create 20 new army units to counter what it calls NATO aggression.
Asked if Moscow's recent moves were justified, Prime Minister Kallas said NATO has done nothing to prompt Russia's military buildup.
"NATO hasn't made any moves, whereas Russia has made moves," she said. "If you look at Ukraine, in Crimea, if you look at Georgia, then Russia has made their moves there."
NATO is currently performing a massive military exercise that aims to test its ability to send troops and military equipment from North America to European ports.
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