KYIV, Ukraine — U.S. Defense Secretary Lloyd Austin made an unannounced visit to Kyiv on Monday in a high-profile push to keep money and weapons flowing to Ukraine even as U.S. and international resources are stretched by the new global risks raised by the Israel-Hamas conflict.

Austin, who traveled to Kyiv by train from Poland, met with President Volodymyr Zelenskyy, Defense Minister Rustem Umerov and Chief of Staff Gen. Valerii Zaluzhnyi.

While there, Austin announced the Pentagon would be sending an additional $100 million in weapons to Ukraine from existing U.S. stockpiles, including artillery and munitions for air defense systems. The package also includes another High Mobility Artillery Rocket System, or HIMARS.

Austin said Ukraine’s effort to defeat Russian forces “matters to the rest of the world” and that U.S. support would continue “for the long haul.”

Zelenskyy said Austin’s visit was “a very important signal” for Ukraine. “We count on your support,” Zelenskyy said, thanking Congress as well as the American people for their backing.

This is Austin’s second trip to Kyiv since Russia’s 2022 invasion, but he’s making it under far different circumstances, as the world’s attention is drawn to the Middle East and signs of fatigue set in with the almost 21-month Russia-Ukraine war.

Austin’s first visit occurred in April 2022, just two months after the start of the war.

At the time, Ukraine was riding a wave of global outrage at Moscow’s invasion, and Austin launched an international effort that now sees 50 countries meet monthly to coordinate on what weapons, training and other support could be pushed to Kyiv.

But the conflict in Gaza could pull attention and resources from the Ukraine fight.

The U.S. has worked feverishly since the Oct. 7 attacks by Hamas on Israel, and the weeks of devastating bombardment on Gaza by Israel that has followed, to prevent the conflict from turning into a regional war.

Even as Austin stood in St. Michael’s Square in Kyiv, the first question asked at a news briefing at the end of the short visit was about Israel’s use of U.S.-provided weapons in that conflict, instead of about Ukraine.

Both conflicts have already seen significant U.S. military support. To back Israel and keep that conflict from spreading, the U.S. has already committed two carrier strike groups, scores of fighter jets and thousands of U.S. personnel to the Middle East, and has had to shift its force posture and conduct airstrikes against Iranian-backed militant groups that are hitting U.S. bases in Iraq and Syria on a regular basis.

For Ukraine, the U.S. has already provided more than $44 billion — and allies have sent an additional $35 billion — in weapons packages that range from millions of bullets to air defense systems, advanced European and U.S. battle tanks and, finally, pledges for F-16 fighter jets.

But Ukraine still needs more, and after almost 20 months of shipping arms to Ukraine, cracks are beginning to show. Some European countries such as Poland have scaled back support, noting their need to maintain adequate fighting ability to defend themselves.

Ukrainian officials have strongly pushed back on suggestions they are in a stalemate with Russia after a long-awaited counteroffensive over the summer did not radically change the battle lines on the ground.