It was this mutual respect that prompted Monaco vice-president Vadim Vasilyev to give Dortmund CEO Hans-Joachim Watzke a special plaque with several photos showing the solidarity between the two sets of fans last week.
"What more could you ask for than to be in the semi-finals?"
Monaco manager Leonardo Jardim: "Our head must be on tomorrow only, nothing else".
Monaco has come a long way since July 27 past year - when it started in the qualifying rounds with a trip to Istanbul.
They are top of France's Ligue 1 and in the French Cup semi-finals while also targeting a first Champions League semi-final appearance since they lost the final to FC Porto in 2004.
But Monaco ensured there was no way back when substitute Valere Germain scored with his first touch with eight minutes remaining to secure a 6-3 aggregate win.
The Germany international's influence for Dortmund is underlined by his 24 goals in 42 Champions League games. "We never tried to protect the result, because our DNA is to attack and to always try and score". Our trademark is to try to score goals.
"Our trademark is scoring goals", mentioned Dortmund coach Thomas Tuchel in the pre-match presser. Nothing has been decided, we have to play our game.
However, following the three bomb blasts that rocked Dortmund's team bus and injured defender Marc Bartra, the Bundesliga outfit will be hoping for better news on Wednesday.
"We wanted to leave at 7:15 p.m".
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"It would have been a mistake to believe that we're already qualified but it doesn't come to mind", Falcao told reporters.
Dortmund almost pulled a goal back in the 14th when Nuri Sahin's free kick from just outside the box beat a stretched Danijel Subasic but not the post, as the rebound shot across the goal mouth and out of danger.
Nobody expected Monaco - conquerors of Pep Guardiola's Manchester City in the last round - to get this far but they have done it playing a superb brand of football that has yielded 141 goals so far this season.
Monaco doubled their lead in the 17th minute as Thomas Lemar picked out Radamel Falcao, who headed into the bottom corner from close range.
That forced the match at the Stade Louis II to kick off five minutes later than planned.
The changes meant Tuchel sent his side out in a 3-5-2 formation, with Marco Reus - who missed the first leg - supporting one-time Monaco player Pierre-Emerick Aubameyang in attack.
After the drama of last week's attack, this was a welcome return to euphoric, attacking football.
It was a frantic spell after Mbappe's opener, with Monaco's attacking midfielder Bernardo Silva heading straight at Burki from a good position and Dortmund's Nuri Sahin hitting the crossbar with a curling freekick.
Monaco made a fast start.