I'm from ol' germany and I am 100% sure, that I played Mass Effect 3 and DAI on english, with english subtitles on now and then.
Lucky you, Germans...
Yeah, there's the English VO dialogue as a free DLC for DAI. Dunno why the OP didn't know about it.
DLC only had VO, and was meant for some EU countries that had localized VO by default on release (Germany, France and Italy, afair). It did NOT include the texts (because the texts were already included for them anyway).
Russia (CIS region, actually) and Poland (don't ask why Poland, ok?) have region-hard-locked native texts (which are subs, UI, codex etc). My guess is that Ukrainians and Belorussians are especially happy to be forced into Russian texts, lol. Anyway, It's impossible to play games (ME3, DAI, any recent Origin game - BF4, SW:Battlefront) in English without 'tweaking' them first. Int_pack for ME3 was quick, it took slightly longer to find a way of restoring DAI.
Note, that some of the BW-peope were talking about 'English for all regions' when asked directly, up to the very DAI release date, which was misinforming people (to put it mildly).
Before someone comes up with 'oh hey, but they are cheap regions, they have it cheaper-blah-blah' - many people I know did 'VPN-shopping'. Because Mexico and Brazil prices are the same (more or less, can be even cheaper for DLCs, actually), and they include all the languages.
So, there are only two possible outcomes for their stupid restrictions, which are :
1. People find way to buy the full international version
2. People buy local version and hack it back.