Where can i find information regarding the kashrut of starbucks outside the US? (mainly for europe)
I don’t know. The first question to answer is what are the laws in those countries and what are the consequences to the store owner if they are not compliant with the those laws.
Assuming it can be established that its the same as American law (which in many countries we know its not) then we need to find out what they actually use to make all the Starbucks products in that country.
I don’t know where to find and verify all this information.