Why Russia's rocket attack on Kyiv is seen as an insult to the U.N.

U.N. Secretary-General Antonio Guterres walks with security personnel as his visits Borodyanka, a town outside Kyiv that was devastated by a Russian attack and occupation, on Thursday. Russia sent a deadly attack into the capital as Guterres visited. (Sergei Supinsky / AFP via Getty Images)

U.N. Secretary-General António Guterres had recently met in person with Russian President Vladimir Putin, and he was on a high-profile visit to Ukraine's capital — but those circumstances weren't enough to prevent Russia from launching a deadly attack on a residential area of Kyiv while Guterres visited the capital city Thursday night.

Ukrainian officials are calling the attack a "postcard from Moscow" and an insult to the United Nations.