https://www.google.com/amp/s/nhl.nbcsports.com/2019/08/11/sabres-ristolainen-hints-at-wanting-out-of-buffalo/amp/
Lets get a top 6 forward for him and keep it moving
I don't think Risto has explicitly asked for a trade. I think he explicitly voiced his displeasure with being on a bad team for so many years and likely offered something along the lines of "I want to play on a better team and I don't care how that happens."