Since PC is not a community carrier and neither Israel nor Turkey are EU members, EC 261/2004 does not apply given that the cancelled segments between those two countries. Moreover, because the second segment is to the EU, not from the EU, EC 261/2004 does not apply.

OP is at the mercy of whatever Israel provides by law or PC provides by contract or as customer service gesture.

No need to over-lawyer this stuff. The EU simply lacks jurisdiction