Removing record based on value

[rinorway]

Is there a preferred method to disable removing a record based on some value of that record ?

For example : you cannot delete an Account if the country is UA.

Same applies to disable "edit" (set record to readonly)

[rinorway]

anyone? It would be very nice to have this in the workflow:

Trigger : before delete record
Criteria : country = UA
Action : show message : You cannot delete Account from UA
Action : disallow deletion