US President Joe Biden on Thursday proposed a $33 billion package for arming and supporting war-torn Ukraine, saying that “caving” into Russia is not an option for the West as the war stretches into a third month.

Speaking in the White House, the US President also outlined proposed new laws to allow using luxury assets stripped from Russian oligarchs under unprecedented sanctions to compensate Ukraine for the destruction wreaked by the invading Russians.

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Biden acknowledged the dramatic costs of the United States backing for Ukraine, but said there was no real choice in the struggle with Russian President Vladimir Putin.

“The cost of this fight is not cheap. But caving to aggression is going to be more costly if we allow it to happen,” he said.

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Reflecting the scale of the US assistance to Ukraine, which is badly mauling the larger and more heavily armed Russian forces, Biden confirmed that the United States has already sent 10 tank-killing weapons for every Russian tank sent into the country.

However, he pushed back against increasingly heated claims by Russian officials and state media that Moscow is fighting the entire West, rather than only Ukraine.

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“We’re not attacking Russia. We are helping Ukraine defend itself against Russian aggression,” Biden said.

Calling rhetoric in Moscow about the possibility of nuclear warfare a sign of “desperation,” the US President said “no one should be making idle comments about the use of nuclear weapons or the possibility that they would use that. It’s irresponsible.”

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And after Russian state gas giant Gazprom announced it was cutting supplies to NATO and EU members Bulgaria and Poland, Biden said the US would “not let Russia intimidate or blackmail their way out of these sanctions.”