The U.S.-mediated indirect talks between Lebanon and Israel have been stalled for months amid disagreement within Lebanon over how big the disputed area is.

Lebanon is home to the heavily armed militant Hezbollah group, which is backed by Iran and has fought several wars with Israel. Hezbollah has also warned it would use its weapons to protect Lebanon’s economic rights.

On Sunday, Lebanon warned Israel not to start drilling in the Karish field and President Michel Aoun said maritime border negotiations have not ended, adding that any move by Israel will be considered “a provocation and hostile act.”

Aoun’s office said Lebanon formally notified the United Nations in February that Karish is part of the disputed area and that the U.N. Security Council should prevent Israel from drilling there in order “to avoid steps that could form a threat to international peace and security.”

The Israeli energy ministry confirmed that the oil rig arrived Sunday, after a five-week sail from Singapore. The ministry said that the Karish field is projected to provide half of Israel’s demand for natural gas and will allow greater exports to neighboring Egypt and Jordan.

Israel’s Energy Minister Karine Elharrar said in an interview on Monday with Army Radio that the field was “entirely in undisputed territory” and called on Lebanon to return to indirect negotiations.