Police and the Fire Service said it had received no reports of injuries of damage on Psara or other nearby islands.
The undersea quake occurred at 3:43 a.m. (O143GMT), 200 kilometers (125 miles) northeast of Athens, the Greek Geodynamic Institute in Athens said.
The U.S. Geological Survey gave the quake's magnitude as 5.0.
Putin's official spokesman Dmitry Peskov commented on remarks in the US media about failures in launching nuclear-capable missiles in Russia
More than 5.8 million people voted for Nicholas Maduro at the presidential election in Venezuela. This is more than a quarter of registered voters. Why did those people vote for the man, who, as Western media write, took Venezuela to the brink of collapse?
It has long been understood that the West has been trying to subject Russian borders to total control. We have not seen such activity even during the Cold War