Transnational cooperation to further rightwing nationalism doesn't make a lot of sense to me. If you believe that your own national (or ethnicity) is superior and the goal should be advancing its own interest over the interests of others, why would you want other countries to be governed by the same philosophy? I would think that a real American firster (for example) would want all the other countries to recognize their subservience to the U.S. and to not primarily pursue their own interests.