After the devastating strikes in Ukraine, Biden denounces "Russian brutality."

US President Joe Biden has condemned a series of Russian missile strikes that killed at least 38 people in Ukraine, calling it a "horrific reminder of Russia's brutality," and vowed to bolster Kyiv's air defenses.

The attacks injured at least 190 people across the country, including some at Ukraine's largest children's hospital in Kyiv on Monday.

Ukraine released photos on Tuesday of what it claimed were fragments of a Russian cruise missile that struck the Ohmatdyt hospital.

Russia asserted that the explosion was caused by a misfiring Ukrainian air defense missile, but the UN stated it was highly likely Moscow was responsible for the attack—a conclusion supported by analysts who spoke to BBC Verify.

This development comes as President Biden prepares to host a NATO summit in Washington later on Tuesday.

He indicated that additional support for Ukraine’s air defenses would be announced during the meeting.

Leaders from the 32 NATO member states, their partner countries, and the EU are gathering to mark the bloc's 75th anniversary. Ukraine's President Volodymyr Zelensky is also expected to attend.

For months, Zelensky has been urging Western allies to increase the supply of air defenses amidst escalating Russian attacks. UN officials noted that May was the deadliest month for civilian casualties in nearly a year.

The summit will focus on defense and deterrence in the context of the Russian invasion of Ukraine.

Ukraine is not a NATO member but has requested to join as soon as possible after its conflict with Russia concludes. NATO's outgoing Secretary General, Jens Stoltenberg, has stated that Ukraine's membership is "inevitable," but not until after the war.

Russia vehemently opposes Ukraine joining the alliance, fearing it would bring NATO forces too close to its territory.

"We will be announcing new measures to strengthen Ukraine’s air defenses to help protect their cities and civilians from Russian strikes," Biden said.

"I will be meeting with President Zelensky to reaffirm our unwavering support for Ukraine."

The UN Security Council is also convening on Tuesday at Ukraine’s request.

UN Secretary General Antonio Guterres joined Western officials in condemning Russia's missile attack on Ukraine.

Kyiv's mayor, Vitaliy Klitschko, declared July 9 as a day of mourning following the deadly attacks on the capital.