Google is making it easier for you to control your Shopping ads by country. 

Google have added a new feed field to give you more flexibility in a single feed. You can now use the shopping_ads_excluded_country attribute to stop certain products showing in specific countries. This attribute will be able to override country targeting at the feed level. 

This is great because you will only need one feed regardless of how many countries you sell in. You can just use the attribute to exclude items from individual countries. You will be able to see diagnostics for each country in the Merchant Center diagnostic report.