I wasn't at war with any of them before they attacked. Only Morocco, The Mamluks, and Poland joined. Bug?
I went straight for Russia in my previous attempts without westernizing but then got destroyed by europeans.Trying to gain it by 1676 means you're doing it wrong. You need to race up Moscow first, and then do a no CB attack on Rome (or attack an ally of theirs, whatever). It's a pretty simple achievement.
The longer you go and bigger you are means you'll actually be really slow getting up there and will have tons of coalitions against you already.
I went straight for Russia in my previous attempts without westernizing but then got destroyed by europeans.