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Local residents walk by a damaged shopping center following Russian strikes in Kyiv on May 25, 2026, amid the Russian invasion of Ukraine. [AFP]

When a teacher at a school in northwestern Russia tried to wake a 16-year-old student sleeping at his desk, he muttered: "You'll regret this."

After the lesson, he grabbed her from behind, pressing what she thought was a pen into her throat. As blood trickled down her fingers, she realised it was a medical scalpel.

"Next time I'll stab you," he said.