Exactly, the countries that "win out" in a trade war are those that are not involved.

Of course there is always the option to try what was done in the late 1929/early 1930 and put in tariffs on every country.  The big swing toward protectionist at that time is a major reason why what should have been a simple recession turned into The Great Depression and then, a decade later, WWII.

Sadly we seem destined to repeat that mistake, hopefully with less disastrous consequences.