I've tested ML long, long time ago, so some things might have changed.
Back then, I've found out the following:
Ml is session based, you cannot access a non default language page, without changing the language setting first.
So if English is default, I cannot access a Russian page that's stored in my bookmarks or is linked to from a different site.
The 302 is generated by sNews, a design flaw in sNews. Instead of producing a 404 instantly it starts off with a redirect (302) to the 404 page, then followed by a 404 header.