Russian-Israeli tycoon's private aircraft flew to Ben Gurion from Moscow on Sunday night; his superyacht Solaris leaves Montenegro marina

Officials caution there are 'legal hurdles' to such a move; protesters occupy luxury property owned by Russian oligarch Oleg Deripaska

Assets and holdings of tycoons beholden to Putin difficult to untangle, experts say

UK asks Chelsea fans to stop chanting owner's name; jet belonging to billionaire spotted leaving Israel for Istanbul

Some planes landing in past 10 days appear to be rented, a possible sign wealthy Russians are looking to slip around financial penalties imposed after Moscow's Ukraine invasion

Weeks after eight-figure donation from billionaire, Holocaust museum hits pause after UK freezes assets and places travel ban on Abramovich over his past ties to Putin

At least seven flights identified over past week, with planes rented from Turkey apparently collecting passengers in Moscow, St. Petersburg, then flying to Tel Aviv

Gov't yet to decide whether to join sanctions on ultra-wealthy businessmen tied to Kremlin; official: 'We mustn't be seen as a country through which sanctions can be circumvented'

Alex Konanykhin says 'Putin must be brought to justice,' notes his responsibility as a Russian citizen to 'facilitate the denazification of Russia'

Targeted oligarchs include prominent Jewish philanthropists, whose giving is vital to the organizations they support but may get ensnared as West bids to isolate Putin over Ukraine