The skies over Kyiv are swarming with unidentified flying objects (UFOs), according to a new report from the Main Astronomical Observatory of the National Academy of Sciences of Ukraine.

Of course, given that Russia and Ukraine have been locked in a months-long war that relies heavily on aircraft and drones, it’s likely that many of these so-called UFOs are military tools that appear too fleetingly to identify, a U.S. intelligence agency has speculated.

Published to the preprint database arXiv, the report — which has not yet been peer-reviewed — describes recent steps that Ukrainian astronomers have taken to monitor fast-moving, low-visibility objects in the daytime sky over Kyiv and the surrounding villages. Using specially calibrated cameras at two weather stations in Kyiv and Vinarivka, a village about 75 miles (120 kilometers) to the south, astronomers observed dozens of objects “that cannot scientifically be identified as known natural phenomena,” the report said.

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Government agencies tend to refer to such objects as UAP, short for  “unidentified aerial phenomena.”

“We observe a significant number of objects whose nature is not clear,” the team wrote. “We see them everywhere.”

The researchers divided their UAP observations into two categories: “cosmics” and “phantoms.” According to the report, cosmics are luminous objects that are brighter than the background sky. These objects are designated with birds’ names — such as “swift,” “falcon” and “eagle” — and have been observed flying solo as well as in “squadrons,” the team wrote.

Read more: Live Science