connection to klei failed

Regrettably, in accordance with current trade regulations relating to your region and outside of our control, unfortunately we are legally unable to provide online services in Crimea. Sadly, with these sanctions, we are bound-by-law and access to the game service from these locations are temporarily blocked.

More information about the sanctions can be found here: http://www.international.gc.ca/sanctions/countries-pays/ukraine.aspx?lang=eng

We do apologize sincerely for the inconvenience that this has caused. Thank you for your understanding. That being said, you should still be able to play Don't Starve Together in in LAN/LOCAL mode by clicking on the "Play Offline" button at the start of the game.

From there, you should be able to go to "Host Game" creating your own local or offline server which will allow you to play the game.

Please see the post/thread below for more information: