Russian forces have escalated their attacks on crowded cities in what Ukraine's leader called a blatant campaign of terror. More than 1 million people have fled Ukraine following Russia's invasion in the swiftest refugee exodus in this century, as per the UN.

A building burns after shelling in Kyiv, Ukraine. Russia has launched a wide-ranging attack on Ukraine, hitting cities and bases with airstrikes or shelling.

Women and children, fleeing from Ukraine, sleep at a makeshift shelter in the train station in Przemysl, Poland.

Passengers rush to board a train leaving to Slovakia from the Lviv railway station, in Lviv, west Ukraine.

A Ukrainian serviceman walks past as fire and smoke rises over a damaged logistic center after shelling in Kyiv, Ukraine.

French teacher Pjotr Vyerko, 81, holds a rifle standing behind the broken window of a bedroom in his house which was damaged by the shock waves of a Russian airstrike in Gorenka, outside the capital Kyiv, Ukraine. Vyerko said he's prepared to use his rifle to shoot invaders because he has a daughter and grandson. "If they come here, I'll jab them with a pitchfork if I don't have weapons -- but I do have weapons," he said.

Firefighters work to extinguish a fire at a damaged logistic center after shelling in Kyiv, Ukraine.

Ostap Datsenko, 31, poses for a photo with a tire shredder that he welded in Lviv, Ukraine. A group of volunteers are constructing metal barriers and tire shredders to be used at new checkpoints across the country in an attempt to stop Russian forces.

Roman, a former Ukrainian soldier injured in combat, gives instructions on how to handle weapons and move during conflict to civilians in the outskirts of Lviv, west Ukraine. The group of friends with no combat experience decided to learn military skills to defend their country from invading Russian forces.

Teenager Artyom, 15, wounded by shelling, lies in a car waiting to be moved to a maternity hospital converted into a medical ward in Mariupol, Ukraine.

Ukrainians cover the sculptures of the Latin Cathedral in Lviv, western Ukraine.

Ukrainians receive CPR training in Lviv, western Ukraine. Russia's invasion of Ukraine has forced more than a million people to flee their homeland in just a week.

A woman bids a man goodbye after boarding a Lviv bound train, in Kyiv, Ukraine. Ukrainian President Volodymyr Zelenskyy's office says a second round of talks with Russia aimed at stopping the fighting that has sent more than 1 million people fleeing over Ukraine's borders, has begun in neighboring Belarus, but the two sides appeared to have little common ground.

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