the soft target of any public relations campaign

I think you mean to ask "what is the difference between public relations and employee relations?" In essence, there is not a difference. Employee relations is a specialty, a niche within public relations.

Define and explain public relations as given by Sam Black. Define and explain public relations as given by Sam Black. Define and explain public relations as given by Sam Black. Define and explain public relations as given by Sam Black. Define and explain public relations as given by Sam Black.

Doug Newsom has written:

'Bridging the Gaps in Global Communication'

'This is PR' -- subject(s): Public relations

'Public relations writing' -- subject(s): Public relations, Authorship, Business writing

'This is PR' -- subject(s): Public relations, Relations publiques

'Public relations writing'

There isn't such a thing as national public relations. International public relations is a specialty, like how investor relations is a specialty. It just means that if you do international relations, the communities you work with, or would like to influence, tend to be outside the U.S.