Sarcophagus Sarshmophagus

According to Russian Federal Atomic Energy Agency Head Alexander Rumyantsev, it's really no big deal if the sarcophagus around Chernobyl's Reactor #4 collapses even more. He said the media is overdramatic about the situation and:

“Even if more leaks appear and the sarcophagus partly collapses, there may be serious social consequences. However according to the experts, there cannot be any serious radiation consequences.”

What experts said that? The last I heard, it was quite dangerous for the sarcophagus to even have the damage that it already does.