I have no idea about exact mechanism of the problem, but as I see it third time this week, I can at least explain symptoms.
Russian (or any other non-standard alphabet - I am sure about Greek for example) coded in UTF-8.
But parser is not always aware about it. And exactly this UTF-8 read as plain ASCII will return you this strange P-infested text.
BTW, it's P-infested in the Russia, where second UTF byte interpretes as Russian 'R' that is written as English 'P'. For the pure English parsers - like in Kingdom of Loathing, second web-site with this problem - this is 'Ð' instead.
Hope it will helps.