There have been seven natural gas discoveries in Israeli waters.
Rome plans to ask the EU to modify the rules of the Sophia mission to rotate the ports where migrants rescued at sea can disembark, with France and Spain expected to top the list.
The drills come amid rising tensions between Russia and the West over Syria's northern rebel-held region of Idlib.
Malta did not aid a boat carrying 190 migrants crossing international waters - the Italian coastguard vessel Diciotti picked it up after the boat neared the Italian island of Lampedusa.
Weeks of non-stop sunshine and near-record temperatures have caused droughts and seen tinder-dry forests consumed by wildfires from the Mediterranean to the Arctic Circle.
The Spanish Maritime Safety Agency said it had picked up a total of 484 people in 30 makeshift vessels in the Strait of Gibraltar and Alboran Sea, which separate Spain from Morocco.
Arrivals have already dropped to some 43,000 refugees and migrants so far this year from a peak of more than a million in 2015, according to U.N. data.
Plastic represents 95% of the waste floating in the Mediterranean and on its beaches, with most coming from Turkey and Spain, followed by Italy, Egypt and France, the report said.
Football matches are organised to alleviate suffering of African illegal migrants held in Libya where tens of thousands are detained in inhumane conditions.
Most of the migrants tried to enter Europe through Italy, Greece, or Spain.