WASHINGTON (AP) — President Joe Biden plans to meet at the White House on Friday with family members of WNBA star Brittney Griner and Michigan corporate security executive Paul Whelan, both of whom remain jailed in Russia, the White House announced Friday.

“He wanted to let them know that they remain front of mind and that his team is working on this every day on making sure that Brittney and Paul return home safely,” White House press secretary Karine Jean-Pierre said at Thursday’s press briefing at the White House.

The separate meetings are to be the first in-person encounter between Biden and the families and are taking place amid sustained but so far unsuccessful efforts by the administration to secure the Americans’ release.

The administration said in July that it had made a “substantial proposal” to get them home, but despite plans for the White House meetings, there is no sign that a breakthrough is imminent.

Griner has been held in Russia since February on drug-related charges. She was sentenced last month to nine years in prison after pleading guilty and has appealed the punishment.

Whelan is serving a 16-year sentence on espionage-related charges that he and his family say are false. The U.S. government regards both as wrongfully detained, placing their cases with the office of its top hostage negotiator.

Friday’s meetings, which both families have long sought, are intended to underscore the administration’s commitment to bringing home Griner, Whelan and other Americans jailed abroad, as well as to “connect with them on a human level as they undergo an ordeal that the Russian government has imposed on them,” said one of the officials, who spoke on the condition of anonymity as the meetings had not yet been publicly announced.

Negotiations have been complicated by the tense relations between Washington and Moscow over Russia’s invasion of Ukraine.