WATCH: White House holds briefing after Biden signs Ukraine, Israel aid bill into law

White House press secretary Karine Jean-Pierre held a news briefing after President Joe Biden signed into law on Wednesday a $95 billion war aid measure that includes aid for Ukraine, Israel and Taiwan and that also has a provision that would force social media site TikTok to be sold or be banned in the U.S.

Watch the event in the player above.

The announcement marks an end to the long, painful battle with Republicans in Congress over urgently needed assistance for Ukraine.

“We rose to the moment, we came together, and we got it done,” Biden said at White House event to announce the signing. “Now we need to move fast, and we are.”

But significant damage has been done to the Biden administration’s effort to help Ukraine repel Russia’s invasion during the funding impasse that dates back to August, when the Democratic president made his first emergency spending request for Ukraine aid. Even with a burst of new weapons and ammunition, it’s unlikely Ukraine will immediately recover after months of setbacks.

Biden approved immediately sending Ukraine $1 billion in military assistance and said the shipment would begin arriving in the “next few hours” — the first tranche from about $61 billion allocated for Ukraine. The package includes air defense capabilities, artillery rounds, armored vehicles and other weapons to shore up Ukrainian forces who have seen morale sink as Russian President Vladimir Putin has racked up win after win.

But longer term, it remains uncertain if Ukraine — after months of losses in Eastern Ukraine and sustaining massive damage to its infrastructure — can make enough progress to sustain American political support before burning through the latest influx of money.

“It’s not going in the Ukrainians’ favor in the Donbas, certainly not elsewhere in the country,” said White House national security spokesman John Kirby, referring to the eastern industrial heartland where Ukraine has suffered setbacks. “Mr. Putin thinks he can play for time. So we’ve got to try to make up some of that time.”

Tucked into the measure is a provision that gives TikTok’s Beijing-based parent company, ByteDance, nine months to sell it or face a nationwide prohibition in the United States. The president can grant a one-time extension of 90 days, bringing the timeline to sell to one year, if he certifies that there’s a path to divestiture and “significant progress” toward executing it.

The administration and a bipartisan group of lawmakers have called the social media site a growing national security concern.

TikTok said it will wage a legal challenge against what it called an “unconstitutional” effort by Congress.

“We believe the facts and the law are clearly on our side, and we will ultimately prevail,” the company said in a statement.

The bill also includes about $26 billion in aid for Israel and a surge of about $1 billion in humanitarian relief for Palestinians in Gaza suffering as the Israel-Hamas war continues. Biden said Israel must ensure the humanitarian aid for Palestinians in bill reaches Gaza “without delay.”

House Speaker Mike Johnson delayed a vote on the supplemental aid package for months as members of his party’s far right wing, including Reps. Marjorie Taylor Greene of Georgia and Thomas Massie of Kentucky, threatened to move to oust him if he allowed a vote to send more assistance to Ukraine. Those threats persist.