The U.S. House of Representatives overwhelmingly approved a bipartisan resolution Wednesday that expresses support for the people of Ukraine.

“The camera of history is rolling on all of us today,” Rep. Gregory Meeks, chairman of the Foreign Affairs Committee, said during a House floor debate.

The resolution, which does not carry the force of the law and is largely symbolic, states that the House "stands steadfastly, staunchly, proudly, and fervently behind the Ukrainian people in their fight against the authoritarian Putin regime."

It also calls for the U.S. and its allies "to deliver additional and immediate defensive security assistance" to Ukraine, and that America "will never recognize or support any illegitimate Russian-controlled leader or government installed through the use of force."

The vote was nearly unanimous, 426-3. Three House Republicans voted against the resolution: Reps. Thomas Massie, Matt Rosendale and Paul Gosar.

Rep. Adam Kinzinger called his Republican colleagues out on Twitter, saying their no vote was "unreal."

Gosar replied: "Talk to me when our border is secure."

Massie explained his vote on Twitter, saying that he thought the resolution was overly broad and that targeting Russia's economy could backfire and cause and further economic stress for low-income Americans.

Rosendale has previously argued that the U.S. has no moral obligation to help either side in the conflict.

-ABC News' Mariam Khan

The U.S.'s latest sanctions will likely not have much of an immediate effect but will impact Russia's economy in the long-term, experts told ABC News.

With new sanctions on additional entities linked to the Russian defense sector -- and by focusing on the long-term capability of Russia’s oil and gas sector -- the U.S. is “continuing to keep tightening the ratchet” on Russia, Emily Kilcrease, a former U.S. trade official, told ABC News.

Extending the strict export controls that the U.S. imposed on Russia to Belarus -- meaning Belarus also won’t be able to import technology like semiconductors with any U.S-developed components -- sends "a very clear signal that any country that supports Russia is going to be subject to really harsh responses,” Kilcrease, a senior fellow with the Center for a New American Security, said.

Going after oligarchs -- whose assets the Justice Department created a task force to seize -- will have a “psychological” effect on the Russian elite, creating a “feeling of being closed out of the developed world,” Eliot Cohen, a former senior State and Defense Department official who is now with the Center for Strategic and International Studies (CSIS), told ABC News.

The U.S. and Europe have yet to block all imports of Russian oil and gas. Energy expert Ben Cahill said Russia’s energy sector is already feeling "de facto sanctions," with companies reluctant to do business there "because of the fear factor."

Fully sanctioning Russia’s oil and gas exports would "be a much, much bigger scale, the price impact would be dramatic, and it would lead to a scramble around the world for alternative supplies," said Cahill, who is also with CSIS.

The world just doesn’t have enough oil and gas to make up the difference, he said.

-ABC News' Ben Gittleson

In a televised address, Ukrainian President Volodymyr Zelenskyy claimed that almost 9,000 Russian soldiers have been killed since the start of the invasion.

He said in the Mykolayiv region in southern Ukraine they've had to use dozens of helicopters to evacuate dead and wounded soldiers.

"Ukraine doesn't want to be covered with Russian corpses,” Zelenskyy said, appealing to the Russian troops. “Tell your commanders that you don't want to die, get back to where you've come from.”

Ukraine's figures stand in stark contrast to Russian reports on its casualties. Russia's Defense Ministry said earlier Wednesday that 498 Russian service members have been killed and 1,597 wounded since the invasion started.

ABC News hasn't independently verified a total.

-ABC News' Patrick Reevell

Several hundred Stinger anti-aircraft missiles were delivered to Ukraine's military Tuesday, a senior U.S. official has confirmed to ABC News.

Additional shipments of the portable surface-to-air missiles are anticipated in the near future, the official said.

The missiles are part of a $350 million lethal defensive aid package to Ukraine that President Joe Biden authorized late last week. It also includes anti-tank weapons, small arms and body armor.

Germany also announced in recent days it will provide 500 Stinger missiles to Ukraine, along with 1,000 anti-tank weapons.

-ABC News' Luis Martinez