If, of course, you ignore the Carolingian Renaissance. Don’t forget, it was a Frankish army under Charles Martel that defeated the Muslims at Tours. It was a combined Roman and Frankish army under Aetius that defeated the Huns at Chalons-sur-Marne. Western Europeans defeated the Vikings by converting them to Christianity (almost a third of the First Crusade was Viking) and they drove the Muslims from Spain.
The Moslem converts and settlers in SW France relocated to Spain. I know it's popular to give Charles Martel credit for convincing them to do so, but economic and social factors also played a part. Frankly, France in that period was entirely too primitive to support the kind of city life that'd was a hallmark of North African and Arabic lifestyles.
By the 16th Century they were rapidly becoming the greatest power in Northern Europe, and during the Thirty Years War the Swedish Army definitely kicked some tail. (We also recall that earlier the Swedish Army set up the Swedish Empire).
I'm not sure today's Viking descendants would agree with you that the Vikings had actually been defeated or that such action was really necessary!
Two out of the last three major leaders of Russia/USSR have been obvious Viking descendants ~ Gorbachov and Putin. Yeltsin was obviously of Slavic "Great Russian" descent.
The last 42 US Presidents have clearly had Viking ancestry (most of them quite provable), and ALL the kings and queens of England since the 11th century have had Viking blood.
You Greek perhaps? Western European people today have no fear of Vikings and look back proudly at their rugged and resourceful ancestors who plundered the world with tiny boats.