Sustained Russian attacks on Ukraine’s power grid in recent weeks have forced leaders of the war-ravaged country to institute nationwide rolling blackouts

Russia has made "tactical gains" in the Kharkiv region of Ukraine, a military expert told ABC News.

Russian news reports say a general who was relieved of duty last year after complaining about problems faced by his troops in Ukraine has been arrested on charges of widescale bribery

Defense Secretary Lloyd Austin is committing to keep U.S. weapons moving to Ukraine as Kyiv faces one of its toughest moments against a renewed assault by Russia

Six people were killed in the Russian attack. Plus, more villages are being evacuated.

ABC News’ Martha Raddatz interviews Victoria Nuland on “This Week.”

ABC News’ James Longman reports on the latest in Ukraine on “This Week.”

At least 11 people were reported killed in attacks in Ukraine’s war-ravaged northeast on Sunday, as Russia pushed ahead with its renewed offensive

ABC News’ James Longman reports from Kharkiv, where the latest Russian offensive threatens Ukraine’s second-largest city.

Thousands have fled Ukraine's second-largest city as Ukrainian troops struggle to hold Russia at bay in the east.

A divisive mobilization law in Ukraine has come into force as Kyiv struggles to boost troop numbers after Russia launched a new offensive that some fear could close in on Ukraine’s second-largest city

Vladimir Putin says Russia wants a buffer zone outside Kharkiv with no plans to take the city.

Russian President Vladimir Putin says Moscow’s offensive on Ukraine’s Kharkiv aims to create a buffer zone but that there are no plans to capture the city

Ukrainian President Volodymyr Zelenskyy tells ABC News about the latest Russian offensive, "The situation is very serious. We cannot afford to lose Kharkiv."

Ukrainian President Volodymyr Zelenskyy canceled his trip to Spain and said it was important for him to be with the wounded soldiers.

Ukrainian President Volodymyr Zelenskyy speaks exclusively to ABC News’ James Longman inside a hospital in Kharkiv.

ABC News had an exclusive interview with the Ukrainian President Volodymyr Zelenskyy on Thursday.

Russia's new offensive gained momentum around Ukraine's second-largest city, dealing a blow to Kyiv as it struggles to contain this new front in the war amid delays from the U.S.

Ukrainian forces have withdrawn from some parts of the country’s northeast and were battling Russian troops in other areas

Secretary of State Blinken announced the additional aid in Kyiv on Wednesday.

He said American arms are on the way amid a Russian eastern offensive.

Secretary of State Antony Blinken pledged that the U.S. would swiftly provide much-needed weapons to Ukraine, highlighting Washington and the West's alliances with Kyiv.

Ukraine said it is battling 30,000 Russian soldiers at the border near Kharkiv, as thousands of civilians have been evacuated due to heavy fighting in the region.

The visit comes as Ukraine said 30,000 Russian soldiers are attacking amid the offensive in Kharkiv region. Thousands of civilians have been evacuated during the heavy fighting.

U.S. Secretary of State Antony Blinken is back in Ukraine as the Russian offensive pushes closer to the country’s second largest city in the northeast.

Secretary of State Antony Blinken arrived in Kyiv in the highest level U.S. visit for six months and the first since the $61 billion aid package was passed by Congress.

Russia has launched a ground assault in Ukraine's Kharkiv region, attacking new areas to expand the front and stretch Ukraine's forces, says the region's governor.

As Moscow pushes ahead with a ground offensive, a new war front opens in Northeast Ukraine.

Ukrainian officials and commanders say Russian troops are locked in intense battles with Ukrainian soldiers in the embattled town of Vovchansk and are pushing ahead with a ground offensive that opened a new front to put pressure on overstretched Ukrain...

Moscow is blaming Ukraine for the attack on the city of Belgorod that killed at least 12 people and left more than a dozen injured, according to local authorities.

At leats 15 people were killed, Russian officials said.

Russian President Vladimir Putin has replaced Sergei Shoigu as defense minister in a Cabinet shakeup that comes as he begins his fifth term in office

Moscow is blaming Ukraine for the attack on the apartment building in Belgorod, Southern Russia, that killed at least 13 people.

The Russian Defense Ministry says Moscow’s forces have captured five villages in a renewed ground assault in northeastern Ukraine

Kyiv rushes reinforcements to the Kharkiv region as fighting rages on.

Russian troops with armored vehicles and artillery attempted to break through defense lines in the Kharkiv region. In response, Ukraine's Defense Ministry mobilized reserve units in the area.

Russian forces have launched a new push into the Kharkiv region in Northeastern Ukraine as the Biden administration announces a desperately needed $400 million aid package for Ukraine.

Russia had previously targeted Ukraine's energy infrastructure on March 22, March 29, April 11 and April 27.

Russia launched at least 21 attack drones, including Iranian-made Shahed drones, along with about 55 missiles, Ukrainian military officials said.

Two colonels in Ukraine's State Protection Service were recruited by the Russian FSB and were detained as part of a group planning to assassinate President Zelenskyy.

When Yana and her son were outside Kharkiv in April 2022, their five-story Soviet-era building was hit by Russian Multiple Launch Rocket System missiles.

The $6 billion aid package is the largest ever sent to Ukraine.

The Pentagon has announced new $6 billion military aid package for Ukraine

The Senate Republican leader told ABC News he'll keep fighting GOP isolationism.

The U.S. secretly gave Ukraine ATACMS, long range missiles that can reach deep into Russian-held areas, and U.S. officials say Ukraine used them over the last week

The U.S. secretly gave Ukraine ATACMS, long range missiles that can reach deep into Russian-held areas, and U.S. officials say Ukraine used them over the last week

The Senate on Tuesday passed a package to deliver $95 billion in foreign aid to Ukraine, Israel and Taiwan

President Biden said on Wednesday the U.S. will begin sending military equipment to Ukraine within "a few hours" due to the passage of a long-stalled foreign aid package.

The House of Representatives on Saturday passed foreign aid bills that included billions in aid to Ukraine, Israel and Taiwan.

Israeli Prime Minister Benjamin Netanyahu tweeted out his thanks after U.S. legislators approved more American weaponry for Israel. Meanwhile, Israel launches new strikes in Southern Gaza.