According to experts SVT met there, the Russian military is behind it.
– It is not a real declaration of war. There is no law for this. It is hybrid war, says professor and Russia expert Armand Gosu.
He cites the transportation of grain that runs along the Danube River through Romania from Ukraine as a reason why the Russian military uses jamming equipment to annoy.
But another military expert in Romania is not as convinced that the disturbances are intentionally aimed at disrupting GPS signals in NATO country Romania.
– The most common is that they use radial jamming to protect their most valuable targets. And civilian operations are inadvertently affected. It is not their aim to disrupt Romanian systems, but if they are in the area, the GPS signal disappears, says Adrian Ion-Duta, military expert at the Euro-Atlantic Center for Resilience think tank.