Romanians do not even border Poland/ 3R at this point. Well they do border soviet occupied territories but not German occuppied. How well would proposition for Romanian troops do join from Hungarian territory goes? Unless of course, they cut some deal with Budapest to allow them to sent few divisions to support Slovaks. Czechoslovak Romanian and and Slovak Romanian relations were good. But indeed they will be on the toes regarding Soviets. As will be Hungarians. I am curious how Arpad line in Ruthenia is doing. Projection started OTL in 1939 but actual construction only in 1941. Hungarians would keep their border with USSR covered too.Note, if the Romanians *do* declare war on the 3R, I fully expect that there will not being any significant contribution of Military given their concern about the Soviets. (And I expect the remainder of the countries involved to understand...