The "negative impact" is Cyprus being recognized as a sovereign.
Cyprus is a member of the EU, it is recognised internationally, it is a member of the UN... an electric cable is nothing.
Cyprus is a member of the EU and has been recognized as a sovereign country by pretty much everyone already. The northern part called the TRNC and under Turkish control isn't however.
They will have to acknowledge the territorial waters as Greek, or go, and do something about it.