I don't know if this is helpful but, in previous editions, it differentiated
"Elementals of the plane to which the ring is attuned can't attack or even approach within 5 feet of the wearer. If the wearer desires, he may forego this protection and instead attempt to charm the elemental (saving throw applicable with a -2 penalty to the die). If the charm fails, however, total protection is lost and no further attempt at charming can be made, but the secondary properties given below will then function with respect to the elemental."
and
"Creatures, other than normal elementals, from the plane to which the ring is attuned attack with -1 penalties to their attack rolls"
(emphasis mine)
Which leaves me to believe that, if they are trying to make it similar to how it's been traditionally, [MENTION=60210]jaelis[/MENTION] has the correct interpretation.