Ukrainian President Volodymyr Zelenskyy's top adviser urged the U.S. to "strangle" Russia's economy by imposing secondary sanctions on Moscow's trading partners.

Ukrainian President Volodymyr Zelenskyy’s top adviser urged the U.S. to “strangle” Russia’s economy by imposing secondary sanctions on Moscow’s trading partners, as the White House push for a ceasefire appears to languish.

“Sanctions are working,” Andriy Yermak, the head of Zelenskyy’s office, wrote on Telegram on Sunday, citing data he said shows a collapse in Russian railway capacity over the past 12 months.

“The economy, geared for war, cannot withstand the pressure and is holding on only through the sale of energy resources,” Yermak wrote. “It is possible to strangle the economy with secondary tariffs proposed in the USA.”