CHISINAU, Moldova—At a padlocked storeroom here in the Moldovan capital, under close police guard, there sits a mound of pro-Russian propaganda that authorities say was part of an unprecedented Moscow-led attempt to sway a historic vote on the country’s future.

       Officials say the illegal campaign material, amounting to a million leaflets and newspapers, was churned out to derail Sunday’s presidential election and a referendum on constitutional changes meant to bring the former Soviet republic closer to joining the European Union.

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