Isolationism vs Embargo - What's the difference?

As a noun isolationism

is a national (or group) policy of non-interaction with other nations (or groups).

(wikipedia isolationism)

(-)

A national (or group) policy of non-interaction with other nations (or groups).

"Before contact was initiated by the West, China employed isolationism in their policies."

(wikipedia embargo)

(en-noun)

An order by the government prohibiting ships from leaving port.

A ban on trade with another country.

* 2004 , , Character: Profiles in Presidential Courage

Instead he [Jefferson] proposed an embargo , an end to all trade between America and England.

A temporary ban on making certain information public.

* This copy of the federal budget is under embargo until 2 p.m.

To impose an embargo on trading certain goods with another country.

To impose an embargo on a document.