EASA said all affected airspaces - Israel, Lebanon, Jordan, Iraq and Iran - were closed by the relevant authorities during the relevant period.
Global travel warnings arise as tensions escalate between Israel and Iran, prompting airspace closures and flight cancellations across the Middle East.
The mission is meant to deliver first-of-its-kind views of the phytoplankton -- microscopic plant-like organisms -- that convert carbon dioxide into cellular material to feed oceanic life.
Nearly 500 soldiers of the Territorial Defense Force took part in the search near the city of Zamosc in southeastern Poland.
"The Romanian Army's radar surveillance system identified a possible unauthorized breach of national air space, with a signal detected on the route to the town of Galati," the defense ministry said.
To this day, nobody knows why the small jet lost contact minutes after takeoff and crashed down to earth, four and a half hours later.
China has over the past three years regularly flown its air force into the skies near the island, though not into Taiwan's territorial air space.
The Baltic Sea has witnessed in recent months several interceptions by Russian, US and NATO aircraft.
The no-fly announcement rattled regional nerves as it followed shortly after China staged new war games around Taiwan, which Beijing views as sovereign Chinese territory.
The decision could transform Ben Gurion Airport into a global transit hub between Asia and Europe.
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