To GM:SpoilerWe secretly contact the EU people on our side and organize a strike to arrest everyone there.
Of the highest concern is to have the strike happen as quickly as possible to avoid them having time to erase the data. For this, we'll surround the entire area and then cut off all communications lines at the exact moment when operatives enter the building from above as well as rush in from all ground-level entrances and suitable windows. If possible, casualties are to be avoided and everyone's to be captured alive. Flashbangs, smoke, tear gas, whatever it takes.