Ukraine is finally getting more US aid. It won’t win the war — but it can save them from defeat.

Ukrainian forces are having their best week in months, and it’s coming not on the muddy battlefields of the Donbas, but across the Atlantic.

On Saturday, after months of delay, the US House of Representatives approved $61 billion in new funding for Ukraine, alongside aid packages for Israel and for US allies in the Pacific; last night, the Senate approved the package and sent it on to President Joe Biden. He said he’ll sign it today.

The new weapons can’t come soon enough.

During recent months, the tide has turned decisively against the Ukrainians on...