Escaping the Bear

Mossad accidentally learns that a Russian oligarch is looking for safety for himself and his family.They invite the family to Israel since his fortune was in part the result of his being the founder, head, and majority owner of a cybersecurity company in St. Petersburg. Though already a recognized world
leader in cybersecurity, Israel is very keen to benefit from the gentleman's expertise. With the help of "The Shadow Experts" the group founded by Countess Renate, Mossad works to capitalize on the insights they can gain into Visla Cybersecurity, all the while trying to postpone as much as possible any Russian discovery that the oligarch has indeed defected.
However, a couple of details in the history of the oligarch suggest that he may not be a defector, but a Russian plant, intent on learning as much as possible on the latest techniques and any cyber tools developed in Israel. Yet, Mossad cannot officially doubt the credentials of the individual as the opportunity to sabotage the Russian systems exported to Syria or Iran is potentially too attractive. Furthermore, the onset of the Russian attack on Ukraine does not allow the time which one would need to evaluate the situation as much as desired. Will Mossad be able to protect the oligarch against what seems to be assassination attempts? If those attempts are real, who are the spies in his entourage? On the other hand, if he is a spy, how will Mossad avoid providing too much information to the enemy? Will they solve that riddle early enough?