Ukraine's president showed a harrowing video of dead civilians to the UN Security Council Tuesday and called for "accountability" for apparent Russian atrocities, as fears grow that Moscow is preparing new offensives.

With global revulsion solidifying over civilian killings in the town of Bucha, President Volodymyr Zelensky likened Russia's assault

Ukrainian President Volodymyr Zelensky challenged the United Nations to "act immediately" or "dissolve yourself altogether" during a blistering address Tuesday in which he showed harrowing footage of dead bodies — including children — he said were victims of Russian atrocities.

Likening Russia's actions in Bucha and other Ukrainian cities to

Twitter announced Tuesday it was introducing new measures against Russian government accounts to reduce the impact of official propaganda on the social network. 

The official accounts will no longer be "recommended" to Twitter users across all categories of the app, including in searches, the platform said in a statement. 

The California company,

The Russian army said Tuesday it had shot down two Ukrainian helicopters trying to evacuate the leaders of a nationalist battalion defending the embattled port of Mariupol.

"This morning, April 5, around Mariupol, a new attempt by the Kyiv regime to evacuate leaders of the nationalist Azov battalion was aborted. Two Ukrainian Mi-8 helicopters,