As Russian President Vladimir Putin escalates his invasion designed to topple Ukraine’s democratically elected government, Kyiv is pleading for as many anti-tank and anti-aircraft weapons as possible. While the Biden administration on Saturday approved additional military assistance for Ukraine, there is more the United States and its NATO allies must do — and fast.

That should include expediting and expanding existing shipments of weapons, focusing on what Ukrainian forces need most and what can be delivered quickly. NATO members should not stop there, however. The United States should work with Kyiv to open multiple supply lines to Ukraine to facilitate the delivery of weapons and other supplies, while providing the Ukrainian military with actionable intelligence it can use to target invading Russian forces. To get ahead of the evolving conflict, the United States and its allies should also focus on getting Ukrainians the tools they will need for urban warfare against occupying Russian forces.

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As we watch this tragedy unfold in Ukraine, the bad news is the Biden administration, Ukraine, and NATO allies were unable to deter a Russian invasion. The good news is Ukrainians are fighting hard and Western weapons are helping them defend their country.

U.S.-made Javelin and UK-made NLAW anti-tank missiles have proven deadly against Russian ground vehicles. Ukrainian forces defended themselves in 2014 with only “RPGs and it was difficult to destroy T-72 [tanks],” a Ukrainian military official reportedly said. Now, thanks to Western weapons, “it’s not a problem.”

Read more: Defense News