The country has launched a public procurement process to acquire modular bunkers.
An intelligence report says Moscow aims to slow European rearmament while preparing for future conflicts.
More than three decades after the deadliest peacetime maritime disaster in European history, investigators have uncovered the cause of the tragedy.
Estonia has started installing the first concrete bunkers along its southeastern border with Russia as part of the Baltic Defense Line.
The report highlights a worrying shift in Europe, where Estonia, Finland, Latvia, Lithuania, and Poland are all moving to exit the Ottawa Convention.
Estonia, Latvia, and Lithuania coordinate civil defense measures as fears of a possible Russian offensive grow.
"This is an unprecedented and brazen intrusion, clear proof of Russia's growing aggression."
Military tension rises after Estonia escorts unflagged shadow fleet vessel to Russian waters.
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Estonia, Latvia, and Lithuania brace for potential retaliation as they join the European Union's electricity network.