A Russian-born U.S. citizen already imprisoned in Russia on a bribery conviction has been handed a second 15-year jail term for espionage, Russian news agencies reported

Ukrainian President Volodymyr Zelenskyy said more than 3,000 North Korean soldiers have been killed or wounded fighting for Moscow in Russia's western Kursk region.

Two Russian airports were put under flight restrictions early Saturday after authorities alleged an attack by Ukrainian drones, according to state-run news agencies.

President Vladimir Putin has boasted that his military operation in Ukraine has strengthened Russia and denied that the downfall of a key ally in Syria had dented Moscow’s prestige

Russia's war on Ukraine dominated the opening stages of President Vladimir Putin's annual marathon press conference on Thursday.

North Korea may dispatch more troops to Russia despite casualties, South Korea’s National Intelligence told lawmakers during a briefing Thursday.

A senior Russian general was killed in a bomb blast in a residential neighborhood in Moscow, Russian media reported early Tuesday.

Ukraine's intelligence services released new information Tuesday about the conduct of North Korean troops now fighting alongside Russian forces in the Kursk region.

Dashcam video shows the moment a bomb hidden on scooter detonated, killing Lt. Gen. Igor Kirillov and his aide. Ukraine called Kirillov a war criminal, while Russia called the attack terrorism.

A senior Russian general was killed in a bomb blast in a residential neighborhood in Moscow, Russian media reported early Tuesday.

Lt. Gen. Igor Kirillov, the head of Russia's radiation, chemical and biological protection troops, was killed by a hidden explosive in what Ukrainian sources told ABC News was an intelligence operation.

ABC News’ Ian Pannell and ABC News contributor Mick Mulroy discuss the death of Lt. Gen. Igor Kirillov, a senior Russian general who was killed in a bomb blast in a residential neighborhood in Moscow.

The Ukrainian Defense Ministry's Main Directorate of Intelligence said on Monday that at least 30 North Korean soldiers were killed and wounded in weekend battles.

Two Russian tankers believed to be carrying thousands of tons of oil were damaged off the coast of Crimea in the early hours of Sunday.

A Ukrainian drone has struck a campus belonging to Russia’s National Guard in the Russian region of Chechnya, as Kyiv continues to strike back after a mass air attack from Moscow

Russia launched a massive aerial attack against Ukraine, firing 93 cruise and ballistic missiles and almost 200 drones, Ukrainian President Volodymyr Zelenskyy said. ABC News’ Marcus Moore reports.

Nobel Laureate Oleksandra Matviichuk discusses her work exposing underreported stories of the war in Ukraine and Russian's aggression.

The Pentagon says Russia could launch its lethal new intermediate-range ballistic missile against Ukraine again soon

Lloyd Austin announced the Pentagon will send nearly $1 billion to Ukraine, bringing the total the United States has committed to Ukraine to more than $62 billion.

The Russian woman accused of sneaking onto a Delta flight from New York to Paris has been charged with knowingly and intentionally secreting herself aboard an airplane.

Russia's top general warned America's top general that U.S. Navy ships should not be close to an upcoming Russian hypersonic missile test in the eastern Mediterranean.

Kremlin spokesperson Dmitry Peskov told the Izvestia newspaper in an interview published Wednesday that Russia sees "no grounds for negotiations yet" to end Moscow's war.

Ukraine's air force said it shot down 22 of 28 Russian drones in Moscow's overnight barrage, though acknowledged "several hits on critical infrastructure facilities."

Ukraine's air force said it recorded 110 Russian attack drones launched into the country overnight into Sunday morning.

Russia has carried out a massive aerial attack on Ukraine’s energy system leaving hundreds of thousands without power as winter sets in across the country.

The U.S. is monitoring military cooperation between Russia and China in the resource-rich arctic. ABC News’ Stephanie Ramos travels to Alaska with special ops forces as tensions rise in the region.

All regions of Ukraine were under air raid alerts early Thursday amid Russia's latest long-range drone and missile barrage against the country's energy grid.

Russian President Vladimir Putin on Friday told the Ministry of Defense leadership that his country "will continue testing the latest system," which is apparently capable of carrying a nuclear weapon.

Russia will continue testing and start mass producing the new "Oreshnik" missile that was used to target Dnipro, Ukraine, Russian President Vladimir Putin said.

House Foreign Affairs Committee Member Rep. Gregory Meeks, D-N.Y., joined ABC News Live to discuss what a second Trump term may mean for the war in Ukraine.

Rep. Adam Smith, D-Wash., ranking member of the House Armed Services Committee, discusses the conflicts overseas.

ABC News’ Ian Pannell reports on the fallout after Russia’s launch of a new hypersonic ballistic missile against Ukraine.

Military analyst Steve Ganyard discusses the possible impact of long-range nuclear missiles if targeted toward Ukraine, and the White House’s growing concern of Putin’s actions.

Russian President Vladimir Putin said the attack on a military complex in the city of Dnipro was a response to Ukraine using U.S.- and British-made missiles, to attack Russia.

Former Deputy Secretary of Defense for the Middle East Mick Mulroy says Russia’s latest strike into Ukraine is “something we have never seen before.”

ABC News’ Ian Pannell shares the latest developments on the war in Ukraine.

Ukrainian forces launched a barrage of British-made long-range cruise missiles into Russia, according to multiple reports, as both sides battle to hold territory ahead of President-elect Trump's term.

Retired U.S. Army Col. Dale Buckner weighs in on whether Ukraine's use of long-range missiles will change the trajectory of the war.

Eight ATACMS missiles were fired at an ammunition depot across the Russian border after President Joe Biden authorized their use against Russia earlier this week.

Ukrainian forces fired American-supplied ATACMS missiles into Russia for the first time, officials said. Russian President Vladimir Putin respond by lowering the threshold for using nuclear weapons.

Kremlin spokesperson Dmitry Peskov said Tuesday that Russia's new nuclear weapons doctrine means Ukraine's use of Western rockets "can prompt a nuclear response."

Russian President Vladimir Putin appeared to threaten to use nuclear weapons if Ukraine fired American-made missiles into Russia.

Russian would consider Ukraine's use of U.S. long-range weapons against Russian forces to be a "qualitatively new round of tensions" between the Moscow and Washington.

President Biden has permitted Ukraine to use U.S.-made long-range missiles to strike Russia. These missiles have a range of nearly 200 miles.

Ukraine is expected to soon begin using American-made long-range missiles to hit military targets in Russia's western Kursk region. ABC News’ Patrick Reevell reports from Ukraine.

ABC News’ Patrick Reevell and former Deputy Secretary of Defense for the Middle East Mick Mulroy discuss what Ukraine’s use of U.S. long-range missiles means for negotiations.

It is perhaps on the diplomatic front that ATACMS will make the largest impact.

ABC News’ Patrick Reevell and Luis Martinez discuss President Joe Biden’s potential decision to allow the use of longer-range U.S. missiles in Russia.

President Joe Biden has lifted Ukranian restrictions of U.S. weapons systems to utilize in an attack on Russia.  

Ukrainian President Volodymyr Zelenskyy says Russia fired around 120 missiles, the largest attack on Ukraine since late August.