I've never heard of any EO jurisdiction permitting intercommunion with Rome other than through RC anecdotes.
It's the normal thing down here, in *every* jurisdiction. The everyday standard. What has elicited this thread was that this weekend I commented with a person that this is actually not accepted in the Church just to be compared with ISIS radicalism for suggesting such an outrageously radical idea.
The rationale was basically that
1) Its good economy for the Orthodox Church in Roman countries, an act of mercy in opposition to unforgiving radical fanaticism;
2) It's supported and sanctioned in "several documents" from the Patriarchate of Constantinople since the lifting of the anathemas;
3) Antioch does it with the OO, why would it be wrong to do it with the Romans?
4) Pressed against the issue, some of them backed a bit and said that "maybe people exagerate, but in cases of emergency it would be allowed" e.g. a dying Orthodox could receive the Last Rites and communion from a Roman priest or the opposite, a dying Roman who happens to request an Orthodox priest in the same situation, and it would be savagely cruel to deny it in both cases.
So, basically giving them the benefit of the doubt, I am now trying to find official synodal or patriarchal documents that condone or sanction intercommunion, even if at least, in radical cases like the above.