WASHINGTON >> The Pentagon is poised to send $1 billion in new military aid to Ukraine, U.S. officials said Tuesday as the Senate moved ahead on long-awaited legislation to fund the weapons Kyiv desperately needs to stall gains being made by Russian forces in the war.

The decision comes after months of frustration, as bitterly divided members of Congress deadlocked over the funding, forcing House Speaker Mike Johnson to cobble together a bipartisan coalition to pass the bill. The $95 billion foreign aid package, including billions for Israel and Taiwan, passed the House on Saturday, and the Senate approval was expected either Tuesday or Wednesday.

The votes are the result of weeks of high-voltage debate, including threats from Johnson’s hard-right faction to oust him as speaker. About $61 billion of the aid is for Ukraine.

The package includes an array of ammunition, including air defense munitions and large amounts of artillery rounds that are much in demand by Ukrainian forces, as well as armored vehicles and other weapons. The U.S. officials said some of the weapons will be delivered very quickly to the battlefront — at times within days — but it could take longer for other items to arrive. They spoke on condition of anonymity because the aid had not yet been publicly announced.

Maj. Gen. Pat Ryder, Pentagon press secretary, would not confirm the package or details, but said the U.S. has a robust logistical system in place, built over the past two years of weapons’ deliveries to Ukraine, and is “doing everything we can to be poised to respond quickly” once the bill is signed. He said the U.S. has storehouses of military equipment in Europe and — as it’s done in the past — can tap those to get aid into Ukraine within days.

America’s infusion of weapons comes on the heels of an announcement by the U.K. on Tuesday, pledging an additional $620 million in new military supplies for Ukraine, including long-range missiles and 4 million rounds of ammunition.

The announcement reflects President Joe Biden’s promise Monday in a call with Ukrainian President Volodymyr Zelenskyy that the U.S. would send the badly needed air defense weapons once the Senate approved the bill. Zelensky said in a posting on X, formerly Twitter, that Biden also assured him that a coming package of aid would include long-range and artillery capabilities.

The latest tranche of weapons will be provided through presidential drawdown authority, or PDA, which pulls systems and munitions from existing U.S. stockpiles and sends them quickly to the war front. Some of the munitions are already in Europe, so could move within days to Ukrainian forces.

More than $20 billion in the aid bill is earmarked to replenish U.S. military stocks that have been depleted because they were sent to Ukraine.