I often use 'Show unread posts since last visit' to view the posts I've not read.
Currently I just view all the threads I'm interested in and then mark the rest as read.

Since I don't read russian, is there a way to exclude posts in the russian forum from that view?

or can I automatically mark them as read?
or do I just keep doing what I'm doing?
or should I just learn russian?

You can still read them with the Google Universal Translator.

Thanks.
That hides them on the main page, but they still show up in the: Show unread posts since last visit view.