Former U.S. Ambassador to Russia John Sullivan, who served under the Biden and Trump administrations, joins "CBS Mornings" to discuss the impact and timing of President Biden's approval of Ukraine using U.S.-made long-range weapons in Russia.

Ukraine suffered what it said was the largest missile and drone attack from Russia since the summer. Chris Livesay has more.

Ukraine plans to conduct its first long-range attacks in the coming days, sources said, without revealing details due to operational security concerns.

Air defenses could be heard engaging drones over Kyiv in the night, and a series of powerful blasts rang out across the city as the missile attack was under way in the morning.

'From our side, we must do everything so that this war ends next year, ends through diplomatic means,' Zelenskyy said in a Ukrainian radio interview aired on Saturday.

Ukrainian President Volodymyr Zelenskyy says Russia is amassing troops in preparation for an assault on the Kursk region, which Ukrainian troops took partial control of during a surprise offensive months ago. Imtiaz Tyab reports on the escalating violence...

Russia and Ukraine carried out their largest drone attacks on each other since the beginning of the war. Chris Livesay reports.

A massive drone strike rattled Moscow and its suburbs overnight into Sunday, injuring several people and temporarily halting traffic at some of Russia's busiest airports.

krainian drones struck a munitions factory in central Russia in an overnight attack, a source in Ukraine's SBU Security Service told Reuters on Saturday

A new Axios report says that billionaire Elon Musk was on a phone call between President-elect Donald Trump and Ukrainian President Volodymyr Zelenskyy, underscoring that Musk has a seat at the table as Trump navigates his return to power. Robert Costa ha...

The explosions in courier depots in Britain, Germany and Poland in July had the potential to mark a serious escalation by causing an explosion on an aircraft.

Many Ukrainians fear that President-elect Donald Trump will cut critical support to Ukraine or broker a deal that would have their country surrender territory and influence to Russian President Vladimir Putin. Imtiaz Tyab reports from Kyiv.

Trump and his running mate JD Vance have openly railed against continuing American military and financial aid for Ukraine and have vowed to push a negotiated end to the war.

Throughout his campaign, President-elect Donald Trump has repeatedly promised to negotiate peace between Russia and Ukraine, vowing that Moscow's war on Kyiv would quickly end after he won the election. Imtiaz Tyab has more.

U.S. Secretary of State Antony Blinken said as many as 8,000 North Korean troops are believed to be in Russia's Kursk region preparing to fight against Ukrainian forces.