Buhari new foreign policy signed into law

I think there may be some misinformation here.

As of my knowledge cutoff, there is no evidence to suggest that President Muhammadu Buhari has signed a new foreign policy into law. Nigeria's foreign policy is guided by the country's constitution and international treaties, as well as the country's national interests and values.

It's possible that you may be referring to a specific policy initiative or statement made by the President or the Nigerian government, but it's not a new law that has been signed into effect.

If you could provide more context or clarify what you're referring to, I'd be happy to help you find more information.