While the internet was still ringing with wild speculations about the nature of these two events in late 2009, a third ‘sky spiral’ appeared over southeastern Australia before dawn on June 4, 2010. It turned out to be a post-launch surplus fuel dump from a slowly spinning upper stage of the very first orbital launch of the SpaceX ‘Falcon-9’ space booster. But once again, to the Internet audience of enthusiasts, it was absolutely inexplicable in prosaic terms.
Enthusiasts mobilized to discover more such ‘spiral UFOs’, and quickly found a then-recent case from 2006 over Tomsk, Siberia [a satellite launch]. See
… and soon were treated to a new one on Dec 23, 2011, when in a fairly unique spaceflight accident a satellite rocket’s upper stage exploded halfway into orbit. Its ascent was observed from an airliner, and the explosion was spotted from the ground [including one dashcam view that caught the moment of the explosion from a street in Novosibirsk that was later found on Google streetview and the exact azimuth to the explosion measured]. Subsequent observers watched as its expanding fuel cloud descended into Earth’s shadow and then, moments later, as the rocket fragments entered the atmosphere and burned up as fireball meteors. One of the pieces hit a house on ‘Cosmonaut Street’ near Tyumen in Siberia. The correlation of the sightings [and the recovered debris] proved its earthborn nature, but on the internet it was still another UFO.
By 2018 the Russian launches were finally generally recognized for what they were [including one spectacular launch during World Cup final games], although a tour of youtube.com and rutube.ru still showed many sites promoting that object as an alien visitor to an eager audience.