We check this website, now oborona-spb.org is up and dont blocked for our system and other users of the Internet.
So, answer to question: Is oborona-spb Down Right Now? - NO! oborona-spb is up!
If you have problem with access to site oborona-spb, and domain oborona-spb.org is not avalible.
Clear browser cache and/or try other web browser
(Chrome, Firefox or Safari).