Greece recovered the bodies of four dead migrants and rescued 27 others after their boat sank off the island of Kos in the southeastern Aegean Sea, the Greek coastguard said late on Tuesday.
Three coastguard ships and a commercial vessel were searching for more people in the area, it added.
In a separate incident early on Wednesday, a cargo ship rescued 96 migrants after their boat sank off the tiny island of Gavdos, near the island of Crete in the Mediterranean Sea, the coastguard said.
It said one of its vessels with four other ships and a helicopter were searching for any missing people amid moderate winds.
Greece was at the frontline of a migrant crisis in 2015-2016 when more than a million people, mostly Syrian refugees, crossed from Turkey to the country by sea, mostly on inflatable dinghies.
The number of arrivals fell before resurging last year as many migrants attempted the new southern route through Gavdos.
Israel and the United States are both determined to thwart Iran's nuclear ambitions and its "aggression" in the Middle East, Israeli Prime Minister Benjamin Netanyahu said on Sunday following a meeting with US Secretary of State Marco Rubio.
France said on Sunday it would host a summit of European leaders on Monday to discuss the Ukraine war and European security as the continent tries to respond concretely to US President Donald Trump's unilateral approach to the conflict.
An Israeli airstrike killed three policemen east of Rafah in the southern Gaza Strip on Sunday, the Hamas-run interior ministry said, calling it a breach of the fragile January 19 ceasefire.
At least 18 people died in a stampede at the main railway station in India's capital New Delhi on Saturday night, the chief minister of the capital territory told reporters early on Sunday.