TALLINN, Estonia -- They may look like soldiers, but theyre actually ordinary men and women with day jobs who volunteer in the Estonian Defence League, a kind of citizens militia.

There are more than 13,000 of them, a civilian resistance force ready to rise up if Estonia were attacked.

Right now, they believe their aggressive neighbor to the east -- Russia -- is enemy number one, especially after its invasion of Ukraine.

Estonia has a professional military too; It was on display in this weekends Independence Day parade.

American soldiers march in Estonias Independence Day parade

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This small country spends big on defense. Its a fully paid-up member of NATO, and that buys it powerful friends.

Estonian Defense Minister Margus Tsahkna

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This year, U.S. soldiers deployed to Estonia were part of the parade, and for the first time they brought tanks.

American tanks on the streets of Estonias capital send a powerful message to the people; that the U.S. will stand by its NATO allies. They also send a clear signal to the Kremlin.

That signal: a Russian attack on Estonia backed by NATO would be dangerous.

We are sending the message to Russia very clearly that we are able to speak the same language as Mr. Putin does, and its language that we are ready to fight, said Defense Minister Margus Tsahkna.

And staying ready means constant training.

On Saturday near the town of Voru, local women of the Defense League were learning to use GPS equipment.

Members of the Estonian Defense League prepare for an annual excercise

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For Ruth Maadla, its about learning new skills. She doesnt really expect the Russian to invade, but I think its good to have the message, she said.

That message to Russia is loud and clear: Estonia is spending record amounts on its military, and the Defence League had never had more volunteers.

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