Tens of thousands are watching jumbo tankers flying near Ukraine on Flightradar 24.
At UTC 22.30 February 28, the tracking website shows a USAF KC-10 (above) flying orbits over Romania close to Moldova, supporting spy planes that are stationed just off the Ukraine border.
The USAF has 60 KC-10 tankers, the military version of the DC-10, for aerial refueling of various military aircraft. This particular KC-10 is based in the UK.

Another tanker that is being tracked is a Royal Air Force KC2 Voyager (A330) tanker (below) which is operating out of Cyprus and is orbiting over Romania right on the Black Sea.
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