No idea but it needs removing as it certainly won't be an apricot!

A wild plum of some sort?

with sharp needles Tugb.?

Many wild forms of the Genus Prunus produce thorns, including some forms of Prunus x domestica--European plums, greengages, and damsons. Around here we usually use forms of peach to graft apricots on, but plums are certainly possible, and may even be preferable in colder climates.