Washington and Moscow are aiming to reach a deal to halt the war in Ukraine that would lock in Russia’s occupation of territory seized during its military invasion, according to people familiar with the matter.

Swiss President Karin Keller-Sutter flew to Washington on Tuesday to seek talks with the Trump administration over the steep 39% tariff imposed on Switzerland. But Keller-Sutter was only able to meet with Secretary of State Marco Rubio, not with any of the primary tariff negotiators.

The threat of more U.S. sanctions jump-started stalled peace talks but might not produce a deal to halt the fighting.