Update 6/17/21: Program has now been separated. Keep in mind the devaluation as well.
Radisson Rewards has announced that in June will launch a dedicated loyalty program, Radisson Rewards Americas, to reward members who stay at hotels in the United States, Canada, Latin America, and the Caribbean. Existing account holders based in those regions will be converted to the new program RadissonHotelsAmericas.com. If you want to continue to earn/redeem points on Radisson Rewards properties outside those areas you’ll need to create a new account on RadissonHotels.com. According to the F.A.Q it will be possible to transfer points between these programs at a 1:1 rate.
I can’t really work out why they would do this with the 1:1 transfer point rate. I guess there could be plans to sell of the U.S. properties in the future and this could possibly make this easier.