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The United States, European Union countries, Canada and Ukraine expelled more than 100 Russian diplomats on Monday in response to Russia's alleged use of a nerve agent to poison a former Russian spy living in the United Kingdom.

Every week, I offer a glimpse of the kind of intelligence assessments that are likely to come across the desk of the President of the United States. Modeled on the President's Daily Briefing, or PDB, which the director of national intelligence prepares for the President almost daily, my Presidential Weekly Briefing focuses on the topics and issues the President needs to know to make informed decisions.

Australia cricket captain Steve Smith has resigned as captain of Indian Premier League side Rajasthan Royals following the ball-tampering controversy which has rocked Australian sport.

At least 56 people are dead and dozens missing after a fire at a shopping center in the Siberian city of Kemerovo on Sunday, a spokesman for the firefighting agency told Russian state media.

Dozens of people have died after a fire broke out in a shopping mall in Kemerovo, Russia.

Saudi Arabia says it intercepted seven missiles fired from Houthi rebels in neighboring Yemen on Sunday, resulting in the first death on Saudi soil since the Gulf Kingdom launched its military campaign three years ago.

Read CNN's Fast Facts for a look at the life of Kofi Annan, former UN Secretary-General and Nobel Peace Prize recipient.

Read CNN's Taliban Fast Facts and learn more about the Sunni Islamist organization operating primarily in Afghanistan and Pakistan.

Read CNN's Fast Facts on genocide, the attempted or intentional destruction of a national, racial, religious, or ethnic group, whether in wartime or peace.

View CNN's Fast Facts about the Vatican, also known as the Holy See.

See CNN's NATO Fast Facts for a look at the North Atlantic Treaty Organization, headquartered in Brussels, Belgium.

A Saharan sand storm turned ski slopes orange in Sochi, Russia, this weekend.

A 50-foot campaign poster of Egyptian President Abdel Fattah el-Sisi stares down over Cairo's Tahrir Square, where hundreds of thousands of Egyptians demanded bread, freedom and social justice during the 2011 Arab Spring uprising. Across from the square, a huge screen shows a video montage of the President and his supporters.

With nearly every corner of Cairo plastered with campaign posters of President Abdel Fattah al-Sisi, what is difficult to find are the more subdued posters of Sisi's little-known and only remaining rival, Mousa Mostafa Mousa. CNN's Ian Lee reports.

An individual who volunteered for a Brexit campaign effort said the organization broke the law, and in turn, is arguing the referendum vote "wasn't legitimate," according to the United Kingdom's Channel 4 News.

An heroic police officer who swapped places with a female hostage during an attack by a fanatical ISIS supporter on a supermarket in France has died of his wounds.

Dozens of marches are taking place Saturday in cities around the globe, where Americans abroad and their foreign allies are lending their voices to the gun control cause.