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Here's a source supporting that theory.
Two of three NATO surveillance planes deployed temporarily to Romania have arrived at an air base near Bucharest, from where they will fly missions to monitor Russian military activity near the borders of the 30-nation military alliance.
The Airborne Warning and Control System planes landed at Otopeni air base on Tuesday afternoon, with one more expected later. They are due to be based there for several weeks.
The AWACS aircraft, which NATO refers to as its “eyes in the sky” belong to a fleet of 14 usually based in west Germany. They have large fuselage-mounted radar domes and can detect aircraft hundreds of kilometers away.
Germany’s ambassador to Romania, Peer Gebauer, said on the airfield after the first plane landed that the deployment “underlines our resolve to stay strong in this time of crisis.”
“This AWACS surveillance mission, which is to start today in Romania, is another proof of our resolve — of our commitment to defend every inch of allied territory,” he said. >

I sometimes watch flight radar and there are AWACS planes from Turkey, the USA, and England that fly in SE Romania during weekdays, usually.  Also, drones are up there.  I only once saw a U2 taking off from Crete.  They are up there somewhere, but have their identification turned off.    Then, there are fighter jets that don't show on the flight radar.  
Most of those aircraft fly from in Europe at bases in England, and Germany as well as Italy, the Netherlands and Turkey.  They fly a long way from those bases.  It will save tremendous man hours and price on maintenance and fuel to put them in Romania. >

if you look at flight radar, there also always are those large us drones that simple circle right before the coast of ukraine , most of those fly from italy iirc. Romania is a bit closer obviously >

Forte10 says "hello" >

Forte10 my beloved<3 >

This seems to be a response to the last missle attack where all the warning systems failed most likely due to jamming by the russians.