Well, this tattoo is really hard to interpret, mostly because there are two ambiguous words there.

The first is сук, which is a plural of сука and which is a cuss word
It can mean a slut or a bitch, but it can be also said to anyone, be it a man or a woman, who was villainous to you, especially someone who intentionally let you down when you most needed their help or support.
The second one is мир, which can be taken as peace or world.

So let me try to translate the tattoo's text relying on what I've explained.

Kill all potential "let-you-downs", snitches and rat bastards.

Then finally, there will be peace.

But it's kind of rough translation though.

Maybe someone would come up with a better interpretation.