I was going to say the comparison to Japanese internment was an unfair comparison but Pavel made it first himself. Widespread detainment based on nation of origin should not be a thing anywhere.
Russian citizens should be under, or at least expect to be under, some security scrutiny. How much scrutiny is an open question to me but I could see Russian citizens being a little more than usual. But anyone should be in a foreign country. If you go taking pictures of national security sensitive places you shouldn't be surprised if you are shooed off or possibly detained depending on what exactly it is.
This sounds familiar. Presumption of guilt based on their heritage or nation or origin is discrimation.
Quoting Lieutenant General John L. DeWitt, head of the Western Defense Command (1943):
save