[pbasista]

> Can the EU sign treaties that are binding on all member countries?

That depends on the topic of the treaty.

The EU member countries have delegated their decision making powers on certain limited number of topics to the EU institutions, like The EU Commission, The EU Council or possibly others. One such topic is the trade. As a result, all EU countries share the same trade policy.

For other topics, where there is no such delegation in place, everything needs to be ratified by every member country individually.

I am unsure into which category this particular treaty falls.