President Donald Trump indicated that if a deal isn't made quickly, he would place high levels of taxes, tariffs, and sanctions on Russia. ABC News’ Karen Travers reports.

“Settle now, and STOP this ridiculous War!," he said in a social media post.

Russian President Vladimir Putin has had a call with Chinese President Xi Jinping, emphasizing the two countries’ close ties, a day after Donald Trump was sworn in as the 47th U.S. president

Russia's air transport agency restricted flights at 3 airports in the region.

Russia and Ukraine exchanged large drone attacks on Sunday night into Monday, with alleged Ukrainian UAVs forcing flight restrictions at three Russian airports.

Three lawyers who once represented the late Russian opposition leader Alexei Navalny have been jailed in Russia as part of the Kremlin’s crackdown on dissent that has reached levels unseen since Soviet times

Over 12,000 North Korean troops are estimated to be fighting against Ukrainian forces in Russia’s Kursk region, the United Nations Security Council learned last week.

Ukrainian President Volodymyr Zelenskyy previously reported that more than 3,000 North Koreans had been killed or wounded fighting in Kursk, while U.S. estimates put the figure at several hundred.

Ukrainian President Volodymyr Zelenskyy warned allies that the defense of his nation is a litmus test for broader Western resolve.

Barnes was accused of child abuse from his ex-wife Svetlana Koptyaeva, a charge the Montgomery County district attorney’s office deemed not credible.

The United States is going to ban Russian and Chinese software in vehicles, according to the Department of Commerce, due to national security concerns.

David Barnes is being held in Russia after a judge convicted him of abusing his children in Texas, but Texas prosecutors say the accusations against him aren’t credible.

Recent alleged sabotage operations in the Baltic Sea have allied leaders on alert.

The Kremlin says Russian President Vladimir Putin will host his Iranian counterpart President Masoud Pezeshkian this week for the signing of a broad partnership pact between Moscow and Tehran

An emergency task force has arrived in Russia’s southern Krasnodar region to deal with the continuing consequences of an oil spill in the Kerch Strait last month

Japan on Friday approved additional sanctions against Russia over its war on Ukraine, including freezing the assets of dozens of individuals and groups and banning exports to dozens of organizations in Russia and several other countries that have alleg...

Ukrainian President Volodymyr Zelenskyy said that some 38,000 Russian troops have been killed or wounded fighting in Russia's western Kursk region since August.

Ukrainian forces on Sunday launched a new offensive inside Russia's western Kursk border region, going on the attack with substantial forces.

Ukraine appears to be going on the offensive against Russia, attempting to seize more territory inside the Kursk region of Russia, the same region where Ukraine mounted a major offensive in August.

George Stephanopoulos interviews Rep. Michael McCaul, R-Texas, on “This Week.”

At least six people were injured in Kyiv as Russia launched a drone strike on the capital in the early hours of Wednesday, city officials said.

The probe into the Azerbaijan Airlines crash in Kazakhstan is examining the conduct of air traffic controllers after the aircraft encountered difficulty, a source said.

Ukrainian special forces have released several excerpts from a purported diary it said was found on a North Korean soldier killed in front-line fighting in Russia.

ABC News contributor and former DHS Acting Under Secretary for Intelligence John Cohen discusses the fatal crash that killed at least 38 people in Kazakhstan.

There are early indications that a Russian anti-aircraft system may have struck the Azerbaijan Airlines plane that crashed in Kazakhstan, killing dozens, a U.S. official told ABC News.

Preliminary reports indicate that a Russian-operated missile shot down an Azerbaijan Airlines flight that crashed in Kazakhstan on Christmas Day, according to a U.S. official.

Ukrainians faced fresh Russian drone and missile strikes on energy infrastructure nationwide on Tuesday night into Christmas Day morning.

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.

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.

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.

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.