How can I Temporarily Take My Site Offline?
None of this is an attack. An attack would be sending 100+ requests per second to your site in an effort to bring it down. Also - don't rely on IP address location too much - it changes ALL THE TIME so a whois lookup on an IP may not reflect it's actual location. Based on your "users online" listing I saw I don't see anything out of the ordinary.
Based on my experience running the largest JR site that I am aware of you will see hundreds of bots from all over the world for hundreds of search engines and anything else that might need to "crawl" the web, hitting your site all the time. This is really normal - especially for an old domain.
Just my 2 cents but I think what you're seeing is very normal.