I could share a few words on Viren and his time in 1969-1970 season in Provo as a foreign student based on material that most non-Finnish speakers are not familiar with.
As there are almost literally millions of kilometers of un-paved road in Finland, it came as a shock for Lasse Viren and Pekka Vasala that everything was paved in the States as Finns had used to run in forests and un-paved roads in the countryside. Vasala also mentions that there were some other problems as coffee drinking (Finns are known to be caffeine-addicts) was not encouraged in the Mormon city.
Viren tells in his 1973 memoirs that "There were a lot Finnish-speakers there, which is on the other hand good and on the other hand bad thing. It is good that you have a lot of companions to discuss with, but bad for exactly the same reason as there was no need to learn the language as it would've been if you were alone". He tells that he learnt "some kind of basics" of English. I had the impression that he always preferred to use an interpreter with the foreign press.
Viren also tells that hated the asphalt roads. "When I returned to Finland by the mid-summer fest, my feet hurt so much at the side of the shinbone that when starting to walk I had to walk at my feet rotated".
He attended his first post-return 5K race a week later where he was 12th and lost not also to other competitors but also to his performances years earlier with a pathetic time of 14:53.6.
That raised serious questions on his time in the States as there apparently were great hopes that he would improve in the States as he was capable in sub-14 min 5K times and he was also the 1969 Finnish champion for the event.