BENGALURU, India — Treasury Secretary Janet L. Yellen mentioned on Thursday that the US would redouble its efforts to marshal world assist to assist Ukraine and warned that China would face repercussions if it helped Russia evade American sanctions.

She spoke as prime policymakers from around the globe gathered in southern India for a gathering that’s anticipated to focus largely on accelerating a worldwide financial restoration after three years of worldwide crises. The warning to China underscores how the impression of the battle continues to reverberate, straining ties between the world’s two largest economies as they have been trying to stabilize their relationship.

“We now have made clear that offering materials assist to Russia or help with any sort of systemic sanctions evasion could be a really critical concern for us,” Ms. Yellen mentioned. “We will definitely proceed to clarify to the Chinese language authorities and the businesses and banks of their jurisdiction about what the principles are relating to our sanctions and the intense penalties they’d face for violating them.”

Ms. Yellen declined to explain particular U.S. intelligence about Russian makes an attempt to keep away from sanctions however the Treasury Division has pointed to makes an attempt by Russia to hunt help from China to produce it with gadgets akin to semiconductors which face commerce restrictions.

Commerce knowledge reveals that China, together with international locations together with Turkey and a few former Soviet republics, has stepped in to offer Russia with merchandise that civilians or armed forces may use, together with uncooked supplies, smartphones, autos and laptop chips. Biden administration officers have expressed concern that China may present Russia with deadly weapons, nonetheless China doesn’t seem to have completed so but.

The USA has cracked down on a few of the corporations and organizations supplying items and companies to Russia. In January, it imposed sanctions on a Chinese language firm that had supplied satellite tv for pc imagery to the Wagner mercenary group, which has performed a big function within the battle for japanese Ukraine. In December, it added two Chinese language analysis institutes to a listing of entities that offer the Russian army, which can limit their entry to U.S. know-how.

On Thursday, Ms. Yellen made clear that the US would crack down on sanctions evasion. “We’re looking for to strengthen sanctions and to verify we tackle violations of sanctions,” she mentioned.

The effectiveness of sanctions on Russia continues to be a topic of intense debate, as latest forecasts from the Worldwide Financial Fund steered that its financial system is performing higher than anticipated.

However Ms. Yellen supplied a darkish evaluation of Russia’s financial system, arguing that sanctions imposed by the US and different Western nations have been working to isolate the Kremlin, drain the nation of expertise and sap its productive capability. Nonetheless, the US continues to view the battle as the most important menace to the worldwide financial system, and Ms. Yellen made clear that the Biden administration is ready to proceed punishing Russia for its incursion.

Ms. Yellen mentioned that the US plans to unveil further sanctions on Russia and that it’s working with its allies to plan methods to tighten restrictions already in place.

“We’ll stand with Ukraine in its combat — for so long as it takes,” Ms. Yellen mentioned at a information convention as finance ministers from the Group of 20 nations, which embrace Russia and China, convened for 2 days of conferences.

The Treasury secretary mentioned that the US had already supplied greater than $46 billion in safety, financial and humanitarian help to Ukraine and that one other $10 billion in financial assist could be delivered within the coming months. Ms. Yellen additionally referred to as on the I.M.F. to “transfer swiftly” with a completely financed mortgage package deal for Ukraine. The I.M.F. final yr accepted greater than $1 billion in emergency financing to Ukraine to mitigate the financial impression of the battle.

“Continued, strong assist for Ukraine shall be a significant subject of debate throughout my time right here in India,” Ms. Yellen mentioned.

The USA hopes to incorporate a condemnation of Russia’s actions in Ukraine within the joint assertion, or communiqué, that the finance ministers are set to launch later this week. Nonetheless, it’s not clear if a decisive assertion shall be potential as a result of Russia is a member of the G20 and India, which is internet hosting the occasion, continues to purchase massive portions of Russian oil.

Regardless of the urgency to deal with the disaster in Ukraine, Ms. Yellen supplied an upbeat evaluation of the worldwide financial system, which has begun to get well. Whereas she acknowledged that headwinds remained, she mentioned the world was on extra steady footing than final fall, when many have been forecasting a worldwide recession.

“It’s honest to say that the worldwide financial system is in a greater place right now than many predicted just some months in the past,” Ms. Yellen mentioned, pointing to a latest world development improve from the I.M.F.

She added that the US financial system was proving to be resilient, with inflation moderating whereas the labor market stays robust.

Throughout their conferences on Friday and Saturday, finance ministers are additionally anticipated to debate methods to alleviate the debt crises going through many growing international locations. Officers are additionally anticipated to place stress on China, which has turn into one of many world’s largest collectors, to reveal extra willingness to let extra international locations restructure their debt.

“I’ll proceed to push for all bilateral official collectors, together with China, to take part in significant debt remedies for growing international locations and rising markets in misery,” Ms. Yellen mentioned.

It was unclear if Ms. Yellen would have any conferences with Chinese language officers this week. She mentioned that retaining strains of communication open about macroeconomic points remained essential.

“I actually count on that we’ll resume discussions,” Ms. Yellen mentioned, including, “I don’t have a particular timeframe in thoughts however I believe it’s essential to take action.”

Ana Swanson contributed reporting.