Was inbound to EBBR, short final RWY 20 (blue arrow) when the appraoch controller shouted "Go around!". I hit the TOGA and when i was climbing out and banking to get into the pattern again i saw a small jet lined up on the runway where i was supposed to come in at. Back into approach controller told me they told a small Russian private jet to hold short of the runway and he just taxied into it and lined up (green line). I didn't even see him as i was looking at the dots. I don't understand that none of the two cockpit crew members do not listen or understand what ground is telling them to do.
