So how does the Western Entente get naval access to the Baltic? Which countries have to be on the WE side? Norway? Denmark? Sweden?
"I can anticipate no greater calamity for the country than the dissolution of the Union... and I am willing to sacrifice everything but honor for its preservation." Robert E. Lee (1807-1870)
Not certain, but I'd think you would need two of the three. I'd prefer the WE having submarine access from 1915 or so, since they actually sent subs in to target German shipping in the real war.