The United States is set to announce over $8 billion in military aid for Ukraine during Ukrainian President Volodymyr Zelenskyy’s visit to Washington on Thursday, two US officials said. It is also during a period when the Biden administration is engaged in intensive negotiations with Congress to see its plan of committing $5.6 billion in military aid ahead of time by the closure of the fiscal year on Sept. 30.

The White House intends to notify Congress Thursday of a $5.6 billion drawdown from U.S. weapons stocks, though the package details are still being worked out. Also under discussion by the Biden administration is a backup plan to report the timelines of shipments that will facilitate the gradual transfer of resources to Ukraine for any potential delivery within the September deadline.

In addition to the drawdown, a separate notification will reveal $2.4 billion in aid through the Ukraine Security Assistance Initiative program. This program enables the administration to purchase weapons from US manufacturers instead of withdrawing them from existing stocks. Munitions, anti-drone weapons, and materials to improve the manufacture of munitions in Ukraine will be among the articles included in this new tranche of aid.

The U.S. also recently authorized another $375 million under the Presidential Drawdown Authority to Ukraine. That package includes the first-ever JSOW, a precision-guided glide bomb with a range of up to 81 miles (130 km). It was not announced that it would be included in the package, but it’s a major upgrade of Ukraine’s offensive capability. Its inventory will also include patrol boats, additional ammunition for high-mobility artillery rocket systems (HIMARS), and different types of artillery ammunition.

In many respects, Ukraine’s new equipment will mirror the development of U.S. military thinking on the topic. Although JSOW is made to be launched from fighter aircraft for high-precision strikes against enemy targets, Ukraine was prohibited by U.S. policy from utilizing its own supplied munitions to launch strikes against Russian territory. This prohibition will certainly be rescinded in light of the new systems and the military role they may play in future conflicts.

This Presidential Drawdown Authority allows the President to draw weapons from existing military stocks to provide aid for allies in cases of emergencies. In August, with Ukrainian territorial losses adding up as the Russians continued gaining ground, Washington released two packages of $125 million each in aid.

In the wake of Russia’s full-scale invasion of Ukraine last year, Congress authorized almost $175 billion in aid and military support for Ukraine and allied nations. Many lawmakers believe additional monetary assistance will be necessary to sustain Ukraine’s defense efforts through the months ahead.

While the increased arms shipments to Ukraine would please US defense contractors, including RTX, Lockheed Martin, General Dynamics, and Northrop Grumman, over their rising military supplies demand, the situation could herald a trend that testifies to growing concern about regional instability and the continued need for the support of allies in Russia’s aggressive moves.