Since it sparked a public scandal, you can think to how people feel about scandals. After getting more info about the Petrov Affair, people were probably felt angry, betrayed, and shocked. (Probably mostly shocked, and maybe some even began to form a prejudice against Russians?)
To help you could see if you could find any quotes about it, on how people felt from maybe news articles or something. You can also go on the history channel's website.
Hope this helped! Good luck!!
Between the time periods of 600-1450 Common Era, it was
referred to as the dark ages in Europe because the cities and regions in Europe
lack poetry, which was a dark experience. It was not really a dark globally,
but only in the part of Europe wherein poetry vanished, but right after the
dark ages, was the beginning of the modern age, which gave life to poetry and
to music once more.