The latest U.S. push to end Russia’s nearly 4-year-old war in Ukraine has unleashed a frenzy of diplomatic activity.

By maintaining stability and innovating to hold out against Russia, Kyiv has shown that size matters less in conflict than it used to

On Tuesday, Russian President Vladimir Putin declared that Russia had taken the Ukrainian town of Pokrovsk, marking the culmination of a 20-month campaign. Ukraine denied the town had fallen, saying that its troops were still in control of the north.

Ukrainian officials say a missile and drone attack killed dozens, right as the U.S. Army secretary arrived to push for peace talks.

In a disused warehouse at an undisclosed location in Ukraine, a military drone instructor who goes by the call sign "DC" showed CBS News a makeshift practice course that students must learn to fly the increasingly indispensable devices through before they join the country's defense against Russia.

NATO chief Mark Rutte warned Vladimir Putin on Wednesday that "we are not going anywhere." Newsweek's live blog is closed.

Fox News chief legal correspondent Shannon Bream and chief national security correspondent Jennifer Griffin assess President Donald Trump’s national security strategy on ‘Special Report.’