Israel's internal security service confirms that a Palestinian who was allegedly abducted from Ukraine last month is being held by Israel.

Dirar Abu Sisi was reportedly abducted from a Ukrainian train last month. He was a senior engineer at Gaza's power plant and was in Ukraine seeking citizenship.

Israel's internal security service confirmed he is being held but refused to comment further.

Smadar Ben-Natan, an Israeli lawyer representing Abu Sisi, said her client "is doing OK." Israel is banning details of his arrest from publication, she said.

Abu Sisi's Ukrainian wife, Veronika, alleges the Israeli secret service Mossad abducted him in order to sabotage the power plant. She denied speculation that he might have been wanted by Israel for ties to militant groups.