If you zero tariffed wine purely under WTO rules you'd have to do it for everyone in the WTO who trades wine.
https://www.wto.org/english/thewto_e..._e/fact2_e.htm
Quote:
1. Most-favoured-nation (MFN): treating other people equally Under the WTO agreements, countries cannot normally discriminate between their trading partners. Grant someone a special favour (such as a lower customs duty rate for one of their products) and you have to do the same for all other WTO members.
Some exceptions are allowed. For example, countries can set up a free trade agreement that applies only to goods traded within the group — discriminating against goods from outside. Or they can give developing countries special access to their markets. Or a country can raise barriers against products that are considered to be traded unfairly from specific countries. And in services, countries are allowed, in limited circumstances, to discriminate. But the agreements only permit these exceptions under strict conditions. In general, MFN means that every time a country lowers a trade barrier or opens up a market, it has to do so for the same goods or services from all its trading partners — whether rich or poor, weak or strong.
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So to persuade a country to sign a specific trade agreement for wine, you would need to keep tariffs on wine, as the benefit of the agreement is to remove the tariffs.