"Europe clearly needs to reduce its dependence on Russia with respect to energy, but we need to be careful when we think about a complete European ban on, say, oil imports," Yellen said.
[...]
"That would clearly raise global oil prices, it would have a damaging impact on Europe and on other parts of the world, and, counterintuitively, it could actually have very little negative impact on Russia, because although Russia might export less [to the EU], the price it gets for its exports[, of say, oil] would go up," Yellen said.

"Proceeds from sales of oil and gas are an importantsource of income for Russia. It would be very useful to try to devise a way to reduce Russia's proceeds from those sales income," Yellen said.

"That really is the proper objective of a ban [on European purchase of, say, Russian oil]. But if we could figure out a way to do that without harming the entire globe through higher energy prices[, or, say, USD-denominated penalties added to purchase of Russian oil by "third-countries"], that would be ideal. And that's a matter that we're all trying to think through together," she continued.

In a private dinner at the Treasury Department, hosted by Deputy Secretary Wally Adeyemo and Ukrainian Finance Minister Serhiy Marchenko, Adeyemo encouraged the business leaders to support Treasury's efforts to aid Ukraine and bolster its economy, either by restarting existing ventures in the country or pursuing new opportunities, an agency official said. Adeyemo also encouraged the executives to provide resources to support Ukraine's reconstruction and financial needs.

The dinner guests included representatives from Bank of America, Citigroup, Goldman Sachs, Mastercard, the Institute of International Finance[,] and the Business Roundtable.
[...]
Ukrainian officials came to Washington this week seeking a roughly $50 billion aid package to cover expected budget shortfalls over the next six months. While Western sanctions have sent the Russian economy and financial system into a tailspin, the war has also walloped Ukraine's economy, which officials said shrank an estimated 15 percent in the first quarter.

International Monetary Fund Managing [IMF] Director Kristalina Georgieva said at a Ukraine roundtable on Thursday that the fund estimates that "over the next two to three months some $5 billion a month may be needed simply to allow the government and the economy to continue to operate in the midst of the war."