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Ukrainian guards are heard firing warning shots to control the crowds of people desperately attempting to flee the capital by train.

For the first time ever, the NATO Response Force has been activated as a defensive measure in response to Russia's ongoing invasion of Ukraine.

CNN's Clarissa Ward describes her journey into Kyiv where she saw a damaged Ukrainian military convoy and civil defense volunteers anticipating the arrival of Russian troops into the Ukrainian capital.

It was only a week ago that the major powers and institutions that hold the Western alliance together were triumphant in their unity over Russia's aggression toward Ukraine. What a difference a full-scale invasion has made.

As Russian missiles flew across the Ukrainian sky Thursday and world leaders decried an invasion spreading across the country, China refused to condemn Russia's move outright, while appearing to levy blame on the United States and its allies.

CNN's Nick Paton Walsh reports from a bridge on the outskirts of Kherson,Ukraine, following intense fighting between Ukrainian and Russian forces for control of the key transportation link.

Ukrainians in the capital Kyiv huddled in air raid shelters Friday morning, as a battle for the city raged overhead with claims of a Ukrainian fighter jet shot down and troops blowing up a bridge to stop an advance of Russian forces.

Russian Foreign Minister Sergey Lavrov said "nobody is going to attack people of Ukraine" and referred to the Russian President Putin's statement when answering CNN reporter Matthew Chance's question about whether Moscow wants to decapitate Ukraine's government.

Former Ukrainian President Petro Poroshenko speaks to CNN from the streets of Ukraine as the Russian military closes in on Kyiv.

UEFA announced that this year's Champions League Final will no longer take place in St. Petersburg following an extraordinary meeting of the governing body's Executive Committee on Friday.

Kira Rudik, a member of Ukraine's parliament, discusses the looming battle for Ukraine's capital Kyiv as Russia invades the country.

On February 24, Russia started a broad offensive in Ukraine. CNN's International diplomatic editor, Nic Robertson, explains how we got here.

A Ukrainian Sukhoi Su-27 fighter jet was shot down over Kyiv early Friday, Ukrainian Deputy Interior Minister Evgeny Yenin tells CNN's Matthew Chance.

A Ukrainian soldier on a tiny island in the Black Sea didn't hold back when threatened with bombing by a Russian warship as Moscow continued its assault on Ukrainian territory.

An audio tape of an exchange between the Ukrainian soldiers on an island in the Black Sea and an officer of the Russian Navy has emerged. All of the soldiers - who were defending Snake Island - are reported to have been killed, according to President Volodymyr Zelensky. This audio has been confirmed and verified as authentic by the Ukrainian Interior Ministry. CNN's Oren Liebermann reports.

Russian forces have seized control of the Chernobyl power plant in northern Ukraine, the site of the world's worst nuclear disaster, according to the agency that manages the area.

As dawn broke across Ukraine, explosions were seen and sirens sounded across the country.

US President Joe Biden unleashed sweeping sanctions Thursday responding to Russian President Vladimir Putin's attack on Ukraine that target Moscow's banking, technology and aerospace sectors, though the US and Europe stopped short of several key steps to target Moscow -- and Putin himself.

CNN's Clarissa Ward reports from a Kharkiv, Ukraine, subway station where citizens have fled amid explosions.

CNN's Matthew Chance details the intense firefight he and his crew witnessed at an airport outside Ukraine's capital, Kyiv.

Eight years after a pro-European protest movement toppled a Kremlin-backed president in Kyiv and Russia fomented a grinding war in the country's east, people in Ukraine have been on tenterhooks wondering what Russian President Vladimir Putin might do next.

The West's initial salvo of financial sanctions against Russia failed to deter President Vladimir Putin from launching a full-scale invasion of Ukraine. Now the United States is taking a punitive approach, announcing another round of sanctions meant to tighten the screws on Russian banks and "corrupt billionaires."

CNN's Matthew Chance shows what it looks like at an airbase outside the Ukrainian capital of Kyiv, where Russian airborne troops are engaged in a fire fight with the Ukrainian military.

Watch Russian rockets fly in the air and tanks roll past CNN reporter Frederick Pleitgen as they appear to head towards Ukraine from Belgorod, Russia.

Just as diplomats at a last-minute United Nations Security Council meeting were pleading for peace, Russian fire began raining down on Ukraine.

My morning today didn't start with coffee. My husband, who works for a company in the energy sector, got a phone call from work before the sun had risen. "Russians are shelling us," he was told.

Two top prosecutors working on the Manhattan district attorney's investigation into the Trump Organization resigned Wednesday, leaving the years-old probe without two key players as it appeared to have entered a crucial phase.

In this week's episode of "Unfiltered," SE Cupp says far-right voices in the Republican Party and conservative media seem "hell-bent" on helping Russian President Vladimir Putin.

As the world's attention focuses on the escalating crisis between Russia and Ukraine, a spotlight has also been turned on an island halfway around the world -- self-governing Taiwan.

Punishing Vladimir Putin and Russia for their aggression against Ukraine will cost us at home. Because to hit Russia where it really hurts, we'd have to hurt everyone.