Ukrainian special forces released new video, claiming it shows troops engaged in fierce gunbattles inside Russia. Ukraine claims troops have seized over 480 square miles to build a buffer zone.

Belarus has deployed aircraft and air defense troops to its border with Ukraine, a day after President Alexander Lukashenko announced he would station almost a third of the country’s military along the frontier

The WHO said Monday that Ukraine has seen 1,940 confirmed health care attacks since the war with Russia began, the most ever recorded in a humanitarian emergency.

Kara-Murza was sentenced in Russian court to 25 years in prison for allegedly spreading false information about Russia's military, but was freed in a prisoner swap made by the Biden administration.

Ukraine attacked the last remaining bridge over a key Russian river, effectively cutting off supplies to what's thought to be hundreds more Russian troops, analysts and Russian military bloggers said.

The Ukrainian military demolished another bridge critically important for supplying Russian troops, the Air Force said Sunday.

The Ukrainian military demolished another bridge critically important for supplying Russian troops, the Air Force said Sunday.

Ukrainian forces blew up a second bridge inside Russia amid Ukraine’s surprise incursion that began nearly two weeks ago. ABC News' Patrick Reevell reports from Kyiv.

One of Russia’s most active volcanoes has erupted, spewing plumes of ash 3 miles into the sky over the far eastern Kamchatka Peninsula and briefly triggering a “code red” warning for aircraft

One of Russia’s most active volcanoes has erupted, spewing plumes of ash 3 miles into the sky over the far eastern Kamchatka Peninsula and briefly triggering a “code red” warning for aircraft

Ukraine continues its incursion in Russia’s Kursk region as Ukrainian officials report destroying a second bridge critical for supplying Russian troops.

The suprise assault into Russia is nearly two weeks old. Ukrainian forces have posted images of a bridge they claim to have blown up cutting off several villages.

Chechnya President Ramzan Kadyrov has invited Tesla CEO Elon Musk to Russia after being filmed behind the wheel of one of the company’s Cybertrucks mounted with a machine gun

Ukranian forces cross further into Russian territory as Russia closes in on a key Ukranian city.

An aide of President Volodymyr Zelenskyy says Ukraine won’t permanently occupy territory it’s taken. However, as Ukraine pushes deeper into Russian territory, it’s losing ground in its own country.

Ukranian military officials say that they are setting up an administrative office in the Kursk region of Russia to “maintain law and order” in the area.

Ukraine now controls over 80 Russian settlements, including the town of Sudzha, since launching its incursion into the Kursk region last week, Ukrainian officials said.

“He’s doing as well as can be expected,” his attorney tells ABC News.

Boyfriend of ballerina Ksenia Karelina speaks out after she is sentenced to 12 years in prison for allegedly organizing fundraisers for Ukraine's military and attending pro-Ukraine rallies.

A former ballerina who lives in California, Ksenia Karelina, was arrested in January and charged with treason, according to Russian state media and the court.

The surprise Ukrainian attack inside Russia is forcing the evacuations of 200,000 Russians as Ukrainian forces have now captured nearly 400 square miles of territory in the Kursk region.

A Russian court sentenced dual Russian-American citizen and former ballerina Ksenia Karelina to 12 years in prison for high treason while Josef Tater faces five years for hooliganism at a Moscow hotel.

The overnight strikes marked the biggest combined attack on Russia's air force infrastructure since the start of the full-scale war, Ukrainian sources said.

Polish prosecutors say they have formally indicted a Russian-Spanish man of espionage

Overnight, the governor of the border region of Belgorod called the situation “very difficult” following attacks by Ukrainian forces.

Russia’s Defense Ministry and pro-Kremlin military bloggers reported Tuesday that Ukrainian forces again launched multiple attempts to break through defensive lines.

General Robert Abrams joins ABC News to talk the significance of Ukrainian forces occupying Russian territory.

Retired U.S. Gen. Robert Abrams breaks down Ukraine’s push into Russia and how it might help with potential negotiations.

ABC News’ Ian Pannell reports after President Volodymyr Zelenskyy confirmed a military offensive is underway 18 miles inside of Russia.

Ukraine’s top military commander says his forces now control 1,000 square kilometers, or 386 square miles, of Russia’s neighboring Kursk region

Ukrainian troops have captured 28 settlements in Russia's Kursk region, as thousands of residents have been ordered to evacuate, Russian officials said.

The Ukrainian military was progressing in its campaign "to push the war out into the aggressor's territory," President Zelenskyy said late Saturday in his daily address.

President Volodymyr Zelenskyy says the push into Russia is to put "pressure on the aggressor." The Kremlin says dozens of Russians have been wounded in the past several days.

ABC's Patrick Reevell reports on President Volodymyr Zelenskyy commenting for the first time on the incursion, praising Ukraine’s army.

Russia has announced increased security measures in the border region of Kursk

Officials say a U.S. Coast Guard cutter on routine patrol south of Alaska's Aleutian Islands came across a Russian ship in international waters but within the U.S. exclusive economic zone

A Ukrainian adviser to the head of President Volodymyr Zelenskyy’s office, Mykhailo Podolyak, on Thursday said one goal was to alter Russia’s perception of the war.

The operation this week represented Ukraine's largest incursion into Russia since the start of the war. Former U.S. ambassador to Ukraine Bill Taylor gives his analysis.

Ukraine’s attacks on Russia in the Kursk region have caused a federal emergency as Russia responded with an attack on a Ukranian mall.

Amina Abakarova is accused of poisoning her opponent’s pieces during a tournament in Russia.

After nearly two and a half years, Ukraine surprised many by taking the battle inside the Russian border region of Kursk.

ABC News’ James Longman has the latest as Ukraine continues its incursion into Russia’s Kursk region.

In the largest incursion since the start of the war more than two years ago, Ukraine has taken control of a number of villages in the border area of Russia’s Kursk region.

George Stephanopoulos interviews White House deputy national security adviser Jon Finer on “This Week.”

In addition to Gershkovich and Whelan, the exchange freed Alsu Kurmasheva, a Russian-American journalist, and Vladimir Kara-Muza, a legal permanent resident of the U.S.

Experts say Vladimir Putin seized innocent Americans to trade for an assassin.

ABC News’ Juju Chang speaks with author and hostage negotiator Mickey Bergman on the complex negotiation process that ultimately led to the release of the three Americans from Russia.

Despite Thursday's historic prison swap, several Americans are still being held in Russia. Chris van Heerden, boyfriend of a detainee, joins the show.

Evan Gershkovich, Paul Whelan, and Alsu Kurmasheva arrived at Joint Base San Antonio around 4:30 a.m. Eastern, officially back home in the United States.

White House national security adviser Jake Sullivan describes what it was like watching the Americans return to U.S. soil and how they are doing after taking part in the prisoner exchange.