I may be wrong but I do know that Orthodox can receive the sacraments from Catholics if no Orthodox clergy are present as a last resort - say like on a battlefield. If for example I was a soldier of the Orthodox faith and a Catholic clergy was the only alternative available on the battlefield I could accept the sacraments - participate in confession - the Holy Eucharist and the last rites, etc. Catholics and no others like Anglicans.
I don't know if what I stated above also allows the Orthodox to partake in the sacraments from Coptic - Jacobite - Assyrian Churches.
I have been taught that I can receive from an RC clergyman in those situations you mention and if I am effectively prevented by distance (real distance I might add) from attending an Orthodox Church. I have been told the same goes for non-Chalcedonian priests.
Destro, that is very similar to what Catholics believe about receiving Communion from an Orthodox. Something to do in an emergency. Which makes sense of course, since if you're a Catholic and you have access to a Catholic priest, why would you choose to receive from an Orthodox priest?