This topic came up earlier, and at the time the situation was fluid enough (with warring adversaries in or near the cities affected) that I left things alone. The tz database technology isn't really up to tracking an active conflict without well-defined frontlines. Until things settle down the two sides can address any problems by using TZ='Europe/Kiev' or TZ='Europe/Moscow' on their computers. Please see the thread starting at: http://mm.icann.org/pipermail/tz/2014-October/021802.html