Ukrainian army resumed its assault on People's Republic of Donetsk, near Kramatorsk:
http://lenta.ru/news/2014/05/13/btr/

Six Ukrainian army servicemen are dead during fighting near Kramatorsk with eight wounded:
http://www.interfax.ru/world/376028

The People's Republic of Donetsk proclaimed founding of its own regular army:
http://ria.ru/world/20140513/1007649410.html

Self-defence forces said they will lay down weapons once Ukraine withdraws its forces from the Republic:
http://ria.ru/world/20140513/1007653930.html

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Ukrainian media report that Jaguar special ops destroyed 54 fighters of the Donetsk self-defence force near Slavjansk, despite being surrounded, shelled and shot at by snipers.
http://www.gazeta.ru/politics/news/2014/05/13/n_6149685.shtml