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Commelina sp
Thanks to Sukanya and Gary, I think this is probably Asiatic dayflower, (Commelina communis), a species introduced to Europe from Far East. Members of Commelinaceae family are also known as 'Widow's Tears'. The plant observed is a vine, crawling over rocks, with small blue flowers; flowers less than 2 cm at their widest point.
Crawling over rocks and stairs hewn in rock, on periphery of a village in the interieur of Peljesac. Mediterranean environment.
Zlatan Celebic,
Commelina communis is introduced here in the US, too. I've seen it as far north as New England growing wild. And this afternoon while taking a walk in the town near where I live I saw plants very much like yours in a garden. I'll be posting photos of them soon.