The United States announced Friday a series of fresh sanctions against those who are supporting Russia's war in Ukraine.

The White House said the new sanctions target more than 200 people and companies in Russia and other countries around the world. The Biden administration will also target a dozen Russian financial institutions as well as Russian officials and will restrict U.S. companies from exporting products to around 90 companies in Russia and other countries, including China, according to the White House.

The products that will be limited, such as semiconductor chips, are being used for "sanction evasion and backfill activities in support of Russia's defense sector," the White House said.

The U.S. will also increase tariffs on Russian metals, minerals and chemicals, which will eventually cost Moscow some $2.8 billion, according to the White House.

"These sanctions, export controls, and tariffs are part of our ongoing efforts to impose strong additional economic costs on Russia," the White House said. "We will continue to work with our allies and partners to use all economic tools available to us to disrupt Russia’s ability to wage its war and degrade its economy over time."

The announcement came on the one-year anniversary of Russia's full-scale invasion of neighboring Ukraine.

-ABC News' Cheyenne Haslett

As tens of thousands of Russian troops lined up along Ukraine’s eastern and northern borders for "military exercises" last February, some international observers warned that Russia was about to do the unthinkable.

U.S. President Joe Biden had declassified intelligence in the weeks prior that showed an attack on Ukraine's sovereignty was imminent. That intel was shared with allies, in an attempt to rally support and to stop the war, but the effort proved unsuccessful. The invasion began on Feb. 24, 2022.

The following four seasons have seen some of the bloodiest fighting on European soil in generations. Tens of thousands of Russian and Ukrainian troops have been killed. And Ukrainian civilians have been terrorized by missiles aimed at energy infrastructure, city centers and apartment buildings.

This month marks both the 9-year anniversary of Russian President Vladimir Putin's invasion of Ukraine's Crimean Peninsula, which he illegally annexed in 2014, and the first anniversary of his full-scale invasion of Ukraine.

The ends to which he'd go in his mission to capture Ukraine have become clear in the last year.

-ABC News' Kevin Shalvey

There was a somber mood over Kyiv on Friday morning as the country marks the one-year anniversary of Russia's full-scale invasion while bracing for a potential barrage of missile strikes.

Ukrainian President Volodymyr Zelenskyy, along with the country's top general and the defense minister, took part in a military ceremony in Sofia Square in the historical center of the capital city. Zelenskyy and Poland's president also visited a memorial wall for fallen Ukrainian soldiers.

Ukrainians are anticipating Russian missile strikes to mark the anniversary, amid warnings from the Ukrainian Air Force that there is a high risk of them. But so far it has been quiet, with no major strikes beyond routine shelling in northern and eastern Ukraine.

-ABC News' Patrick Reevell

Russian President Vladimir Putin announced on Feb. 21, 2022, that he had recognized two Russian-backed separatist areas in eastern Ukraine, Donetsk and Luhansk, as independent states.

Ukrainian President Volodymyr Zelenskyy followed the announcement by saying that Ukraine had cut diplomatic ties with Russia. Putin then gave a speech on Feb. 24, 2022, announcing he would launch a "special military operation" in Ukraine.

Minutes after the announcement, explosions could be heard in Kyiv. What followed was a full-scale invasion of Ukraine, with thousands of troops crossing the country's borders. Here are the key events that occurred in the year since then.

-ABC News' Nadine El-Bawab

One year ago, with Ukraine's borders surrounded by what seemed to be a superior military force, many U.S. officials and analysts predicted a swift Russian blitz to Kyiv.

But after Russian President Vladimir Putin sent his more than 150,000 arrayed troops across the border, it soon became clear that a dual reassessment was in order: The Russian invaders were less potent than advertised, and the Ukrainians were unexpectedly stubborn and wily in the defense.

Some of the Russian troops weren’t even aware they were on a combat mission until Ukrainian bullets came cracking past them, according to U.S. officials. Meanwhile, Ukrainian forces stalled a massive Russian supply convoy through direct attacks and by destroying a key bridge. Only one week into the invasion, Putin's men were plagued with food and fuel shortages, morale running similarly low.

Kyiv stood.

"Putin assumed that Ukraine was an easy target, Putin assumed that Kyiv would easily fall, and Putin assumed that the world would stand by," U.S. Secretary of Defense Lloyd Austin said during a speech in Brussels last week. "But the Kremlin was wrong on every count."

Ukrainian forces were armed with more than grit.

They also had years of U.S. and NATO military training, plus American-made weapons, like anti-armor Javelins and anti-aircraft Stinger missiles. These made Russian vehicles vulnerable to ambush, and left Russian helicopter and jet pilots wary of flying over Ukrainian positions. Indeed, many airmen did not return from their sorties.

Despite astonishing losses of soldiers and vehicles, Putin has shown no inclination to end the conflict anytime soon. And despite its tenacity, Ukraine has also taken significant casualties, and is not able to produce enough of its own weapons and ammunition to keep up the fight.

Ukraine, after thwarting the advance on its capital, and later routing Russian forces from Kharkiv, now largely faces a battle of supply.

"When this war began, Russia had a larger population, a much bigger defense budget, a bigger military, bigger industrial base. So, this became an industrial war and a war of industrial bases," said Seth Jones, director of the International Security Program at the Center for Strategic and International Studies. "This is why Western industrial support has been so critical."

A key question now is, despite massive military aid packages and a promise to send even more, could the U.S. strategy ultimately result, not in a Ukrainian victory, but a stalemate in a years-long war of attrition?

-ABC News' Matt Seyler