Russian Channel 1 in an evening news report on the 16th of May told about events in Slovyansk using two years old videos.
In particular on minute 4:45 of the report they are telling about killed civilians. Here is a reference to the news report on the website vesti.ru.
In reality this video was made after an antiterrorist operation on the territory of the Baksan region of Kabardino-Balkaria.
Below is the news report of the Channel Vesti from 18.11.2012. Here is a reference to the report on website vesti.ru.
Here is the full video, which was published by the Russian National Anti-terrorist Committee.
Here is the official statement of the NAC of Russia, which was published on the website of the Committee: