1: First, NSPs must balance openness and
secrecy. Some nations try to avoid this
problem by using vague language (also known
as “strategic ambiguity”), but this may reduce
the effectiveness of the document. Others
have both public and classified versions of the
National Security Strategy.
2:A Strategy is a special plan made to achieve a market position and to reach the organizational goals and objectives, but Policy refers to a set of rules made by the organization for rational decision making.
3: Common Foreign and Security Policy. In parallel with its growing economic and political power, the EU has created its own foreign and security policy which enables it to speak—and act—as one in world affairs.
I hope this helps!