Witness states: After switching to the NASA ISS live stream channel a clearly defined UFO appeared in the upper left hand corner, above the horizon.
I was able to take a total of 4 screenshots before the UFO disappeared completely from sight.
Gauging that it accelerated away in the same direction the ISS was travelling in, the speed had to be in the tens of thousands of miles per hour.
Each screenshot shows the NASA meter on the bottom which exemplifies the speed from a standstill of the UFO to when it is just a bluish dot in the distance.
Unfortunately, the screenshots, while clearly showing a UFO in two of the frames, does not compare to what I saw on the 480p resolution (highest resolution offered on the live stream) 42" screen I was watching it live on. It was so unquestionably real and present.
The UFO appeared near the ISS at 1:21 p.m. central European time, 5 April 2016. Mufon case 75648.
Besides the screenshots, UFOvni2012 managed to record to incredible sighting on video.