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Serhiy's assault battalion helps plan these attacks – finding a way through Russian minefields and anti-tank obstacles known as "dragon's teeth".

Last year, Estonia furnished the bridge with dragon's teeth – pyramidal anti-tank obstacles of reinforced concrete.

It’s a lot simpler than Poole’s alternative: In The Texas Chain Saw Massacre, he writes, the monsters are “hatched from the dragon’s teeth America sowed in its own soil.”

Anti-tank fortifications known as dragon’s teeth, the pyramids are a sign of the new defenses Ukraine is building in the south against an anticipated Russian offensive.

Besides trenches and other barricades, the layered system includes mines and anti-tank obstacles known as “dragon’s teeth,” normally built in advance of fighting.