China’s Communist Party will block promotions for senior cadres whose spouses or children hold significant assets abroad, people familiar with the matter said, as Beijing seeks to insulate its top officials from the types of sanctions now being directed at Russia.

The ban, outlined in an internal notice by the party’s powerful Central Organization Department, could play a role in Chinese leader Xi Jinping’s efforts to increase his influence at a twice-a-decade leadership shuffle scheduled for later this year.

Issued in March, the directive prohibits spouses and children of ministerial-level officials from holding—directly or indirectly—any real estate abroad or shares in entities registered overseas, the people said.

Senior officials and members of their immediate families would also be barred from setting up accounts with overseas financial institutions unless they have legitimate reasons for doing so—such as study or work—the people said.