The Pentagon warned Congress that it was running out of funds to replace stockpiles of weapons sent to Ukraine, and was forced to slow down the supply of new generation weapons to the US military.

This warning comes after Congress passed a short-term funding bill to avoid a government shutdown that did not include the funds needed to continue fueling the proxy war in Ukraine.

According to the Associated Press, Pentagon Comptroller Michael McCord told House and Senate leaders that the US military has $1.6 billion remaining out of $25.9 billion authorized by Congress to replace weapons that have flowed into Ukraine.

“We have already had to slow down the process of replenishing our forces to hedge against an uncertain funding future,” McCord said in a letter to congressional leaders. “Failure to renew our military services in the required time could harm our military’s readiness,” the letter added.

The Pentagon also has about $5.4 billion remaining under what is called “presidential withdrawal authority,” which allows President Biden to ship weapons to Ukraine from U.S. military stockpiles. The $5.4 billion (mentioned) is what remains of the $6.2 billion that became available after the Pentagon claimed an “accounting error” that overvalued weapons sent to Ukraine freed up more money to spend on fueling the war.

McCord said the Pentagon has run out of money for the Ukraine Security Assistance Initiative, which allows the administration to purchase weapons for Ukraine and is intended to provide more long-term support. Without new funding for the war soon, he said, the Pentagon will have to restrict the types of weapons being sent to Ukraine that are considered “critical and urgent now as Russia prepares for a winter offensive.”

The White House asked Congress to approve allocating an additional $24 billion to Ukraine, which brings total US spending on the war to about $137 billion. While some House Republicans who oppose the proxy war have made it difficult to approve more aid, a majority of Congress still supports the policy, and the $24 billion is expected to pass once it is put to a vote.