More than three years into Russia's full-scale invasion, Ukrainians across the country retreat each night to bomb shelters and metro stations in a nightly ritual.

Russian drone strikes on Ukraine have hit an all-time high, as Kyiv held a day of mourning after one of the deadliest attacks on the capital left 31 dead.

An overnight Russian drone and missile attack on Ukraine’s capital Kyiv has killed at least 18 people, including a six-year-old boy, as well as wounding 159 others, according to Ukrainian officials, prompting United States President Donald Trump to slam Moscow’s actions as “disgusting.”