The last thing any pilot wants to see when about to touchdown is another aircraft blocking his path. So. try and image the increased tension for the pilots of this Utair Boeing 767 as it was about to land on runway 02 at Barcelona Airport on July 5, 2014. An Argentinas Airbus A340 was runway 02 and the Russian pilots had not option but to perform a "go around".
Thankfully the 767 landed safely on its next attempt.