When you start nn with no options, it will find unread articles in all groups to which you subscribe. When there are no more pages in the group, nn will enter Read mode. They're probably in Russian. As I know, the standard Russinans use most is codepage 866, which is an MS-DOS term. I'm not sure they use it on the Net, but I'm going to find out with my friends in Russia.
Similar keys are available in select mode.
This example will use the latter. Use a descriptive Subject for your message. Enter keywords appropriate to your message if you wish, and an optional 1-line summary. Be sure to leave a blank line between the headers at the top of the file and your text. Type s and press return to Send it.