The Wall Street Journal, citing sources in the US Department of Defense, reports that the Pentagon has $5.2 billion available for military aid to Ukraine, and this amount will allow it to maintain supplies for about six months at the current rate. 

According to journalists, the $5.2 billion is meant to guarantee Ukraine's security and will cover the country's needs for weapons and equipment for six months if the United States continues to supply the same amount as it has since March of this year.

"This is about 12% of the total $43.9 billion in security assistance that the United States has provided since Russia's invasion in February 2022," the article says.

In addition, the United States used funds from the Ukraine Security Assistance Initiative (USAI) program to support Ukraine. However, according to the WSJ, the USAI program has now run out of funds.

According to the WSJ, the $5.2 billion remaining in the Pentagon's coffers came after an accounting error was discovered in May that actually gave the US Department of Defense more funds to help Ukraine than it had anticipated. This error was due to the Pentagon's underestimation of the cost of the weapons being delivered. In addition, the Pentagon also has about $1.6 billion that it uses to replenish its own arms stockpile.