Here is a study of what happened in Europe with the arrival of the rapefugee Rs.
https://www.nature.com/articles/s41467-018-02825-9
For example in the baltic states, before around 4,000 BCE, 4/5 samples of Y-DNA are I. After around 3,000 BCE, 13/14 samples are R1a/b Indo-European. Not a single case of Nordics found after 3,000 BCE in the study. Today, Nordic males represent 1/7 or 1/8 of the y-dna population in the Baltic states, this is after settlers from Scandinavia came back to their cousin's homeland thousands of years later, when they were strong Vikings and such Nordics.
I1 had to reconquer Scandinavia from the Rs, after R1a decimated the population of I2a in Mesolithic Sweden. The Corded Ware invasion. Sooner after the Corded Ware invasion was the Proto-Celtic settlements in Scandinavia.
The proto-Celts also decimated the population of I2a in Stone Age Britain, France and Spain. Again it took the I1s, who were a recent development in Europe to reclaim some of the land.
Like jews, the Rs have always been an "us vs them", and Is will never be Rs, so embrace the inner Nordic of Is.
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