"We tried to improve the game level and improve our performance thanks to the substitutions but after 75 minutes, the tempo of the match began going down and down".
Wenger was impressed with Viktor Goncharenko's side but reserved special praise for the way in which Welbeck started the move that led to his well-taken goal.
Mkhitaryan suffered knee ligament damage in the 4-1 quarter-final first-leg win over CSKA Moscow and Wenger was concerned the Armenia worldwide could be out for several weeks. They scored the second, had a chance for the third.
But how did the Arsenal players perform in Russian Federation?
The home side entered the break, buoyed by the confidence of having pulled a goal back, and came out in the second half intent on building on their lead. "It's never enough. You could see this week in Europe that you had a lot of turnarounds and you need to be completely focused, so let's be prepared and see who we play".
The 2-2 result sees the north Londoners progress to the semi-finals courtesy of a 6-3 aggregate scoreline, along with Atletico Madrid, Marseille and Salzburg.
'But once we got to 2-1 it was a big blow for them and they didn't recover from that'.
However, Atletico held on to progress on aggregate after their striker Antoine Griezmann missed a hatful of chances and will take their place in Friday's semi-final draw.
Arsenal reached a European semi-final for the first time since 2008-09, when they lost to Manchester United in the Champions League last four.