Long time no see! Hello Stonehenge!(I mean PSE)
A man named Kasiski gives you a letter that reads this:
Yssy uztzt t hzbvhqfhew wphivzwim mt tbdnhp wnvjchimzos agi qirmmpfmhwp ho uwtbg mt youzme on tgscrkjyh, igfywmtyp dakfdwtx ysot anuocdx eve vfdiaeyj ho afgs imx rsnxytq mthswnxwj os ts tbsmwfaegy tb pktaogtytcn hk thsxqq.
And this:
chile; venezuela, nigeria; canada, germany
japan, australia, new zealand
Liverpool, Manchester, Sheffield, Nottingham, Oxford, Swindon, Bristol, Cardiff
angola, russia, kenya; libya, saudi arabia
malaysia, mongolia; afghanistan, south korea
You have to find what the secret message and locations together references...