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.

Polish Prime Minister Donald Tusk on Monday hailed Moldova's pro-European vote and praised its President Maia Sandu after preliminary results showed that more than 50 percent of citizens said "yes" in a referendum on the country's bid to join the EU.