US President Joe Biden has condemned a wave of Russian missile strikes that killed at least 38 people in Ukraine as a “horrific reminder of Russia’s brutality”, as he vowed to strengthen Kyiv’s air defences.
At least 190 were injured across the country, including some at a children’s hospital in the capital Kyiv on Monday.
It comes as Mr Biden prepares to host a Nato summit in Washington on Tuesday.
The US president said further boosts to Ukraine’s air defences would be announced at the meeting.
Leaders from the 32 Nato members states, their partner countries and the EU are gathering to mark the 75th anniversary of the bloc.
Mr Biden said he will be welcoming Ukraine’s President Volodymyr Zelensky and other Nato leaders.
The summit will focus on defence and deterrence in the context of the Russian invasion of Ukraine.
“We will be announcing new measures to strengthen Ukraine’s air defences to help protect their cities and civilians from Russian strikes,” Mr Biden said.
“I will be meeting with President Zelenskyy to make clear our support for Ukraine is unshakeable.”
The UN Security Council is also meeting 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, Vitali Klitschko, declared 9 July as a day of mourning following the deadly attacks on the capital.
Two people died when a missile flattened part of the Ohmatdyt Children’s Hospital – Ukraine’s biggest paediatrics facility – and a search for survivors beneath the rubble continued into the early hours of Tuesday.
President Zelensky has been urging Western allies to step up deliveries of air defences for months, amid increased Russian attacks. UN officials said May was the deadliest month for civilian casualties in almost a year.
The government in Kyiv says it desperately needs new US-made Patriot air defence systems. But Western officials have been reluctant to surrender any more of the limited number of surface-to-air batteries scattered across the Nato alliance.
Original reporting by BBC World Service
