I have 2 Kiev 6Cs (predecessor to the K60).
Remove the prism from your K60. Tape a rectangle of white plastic grocery-bag across your K60's film rails. Make sure the plastic film just tight enough, so that it's flat and will not catch in the shutter.
Mount your empty K60 on a tripod, then focus on a nearby object. Wind and set your shutter to 'B', then fire the shutter and keep the button pressed so the shutter stays open.
Look at the image on the plastic film. Is it sharply in focus? You might want to us a loupe to check.
If the image is not in focus, adjust focus so it is. Check the K60's screen. Is the image there in focus?
If it is, then you have a different problem. If not, then you need to adjust the ground glass.
Go to:
http://www.rickdenney.com/The_Kiev_Report/Kiev_report_webpage.htm
Click "Go to the Message Board"
There is a wealth of repair information for K60s, among other FSU cameras, and links to FSU repairmen. I had Leonid Treskunov CLA a couple of my Kiev RFs and a K-17; I give him a very strong recommendation.
There is likely a groundglass adjustment thread somewhere, possibly with links to drawings.
You may need to register in order to ask a question, but it is a simple matter.