To start with, moderation will apply to posts older than 14 days. But if this does not stop the spam attacks, then I will apply moderation to comments on more recent posts too. Moderation will remain in place until Google cleans up its act regarding control of spam commenting on Blogger. That probably means indefinitely. I am very sorry about this, as I know it will inhibit discussion on my site. But I can't keep cleaning out spam comments like this. Something has to give.
I hope my readers will understand and continue to comment constructively despite the inconvenience.