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That came despite an international agreement calling for all sides in Ukraine to refrain from violence and for demonstrators to vacate public buildings. It did not specifically prohibit security operations, but Ukraine suspended an earlier so-called “anti-terrorist operation” after the accord.

On Saturday, a few kilometers north of Slovyansk, two Ukrainian military helicopters circled overhead as a column of at least five armored personnel carriers patrolled country roads.

On one road leading west of the nearby town of Sviatohirsk, more than two dozen troops in black fatigues unloaded from the vehicles and stopped some drivers in the passing traffic, frisking passengers and inspecting vehicles for weapons.

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Laura Mills in Moscow contributed to this report.