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Phytolacca americana
Phytolacca americana is on an invasive species list of Greece. http://www.researchgate.net/publication/... This spotting specimen is not P. dioica (color) http://www.florasilvestre.es/mediterrane... or P. esculenta http://www.bio.bas.bg/~phytolbalcan/PDF/... (note numbers of fruit sections).
Pokeberry. Genus phytolacca. I don't know what species you have there in Greece.