Secretary of Defense Lloyd Austin announced a new military aid package for Ukraine of up to $100 million during an unannounced trip to Kyiv on Monday.

This aid package, which will be provided through the Presidential Drawdown Authority and comes from existing U.S. stockpiles, includes Stinger anti-aircraft missiles, one High Mobility Artillery Rocket System, and additional ammunition (155mm and 105mm artillery rounds), among other weapons and gear.

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"I wanted to reassure the leadership that the United States of America will continue to support Ukraine, and we talked about the things that we're going to continue to do to make sure that they have what they need to be successful on the battlefield," Austin said, saying that his conversations with Ukrainian President Volodymyr Zelensky and Ukrainian Defense Minister Rustem Umerov were "very constructive."

The U.S. is running out of funding available for Ukraine, relying now on extra funds that were discovered after an accounting error. The error, which occurred because the Department of Defense was tallying the total cost of the weapons it was paying for to replace the older versions it would give to Ukraine instead of using the cost of the weapons provided to Ukraine itself, resulted in the discovery of roughly $6 billion in additional funding.

Despite President Joe Biden's repeated statements of unwavering support for Ukraine, Congress has yet to pass his supplemental funding request that includes more than $60 billion in funding for Ukraine. House Republicans, who are in the majority, are splintered about whether the U.S. should send more aid to Ukraine, while support for it is broader within the Democratic Party.

"This is why we've been very clear about the supplemental, about asking for additional Ukraine funding, so that the brave people of Ukraine can continue to fight against the aggression we've been seeing from Russia," White House spokeswoman Karine Jean-Pierre said during Monday's briefing. "There's a lot at stake."

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Zelensky said last week that deliveries of artillery shells to Ukraine have "really slowed down."

Austin's trip to Ukraine comes ahead of this week's meeting of the Defense Contact Group, which meets monthly to discuss Ukraine's latest needs. Defense leaders from roughly 50 countries will participate in this effort.