Russia is using all the levers of influence at its disposal to block Moldova from joining the EU. The EU is trying to impose sanctions on Russia for its actions in Ukraine.
Russia is also trying to stop the flow of money into Moldova. The two countries are at odds over who controls the airspace in the east of the country, and who controls it in the west. The conflict in Ukraine has been raging for more than a year, with both sides blaming the other for the conflict in the region.