According to Reuters, The European Union has signed a free trade deal with Vietnam:
The European Union signed a landmark free trade deal with Vietnam on Sunday, the first of its kind with a developing country in Asia, paving the way for tariff reductions on 99% of goods between the trading bloc and Southeast Asian country.
The article specifies more information, but I cannot find the rationale of such an agreement (i.e. what's in it for the EU?).
Question: Why did EU sign a free-trade deal with Vietnam?