NATO Secretary-General Mark Rutte said he had visited the southern Ukrainian city of Odesa with President Volodymyr Zelenskiy on Tuesday and declared NATO's support for Ukraine was unwavering. Rutte's visit was a show of solidarity with Kyiv following a Russian missile strike on the northern city of Sumy on Sunday that killed 35 people and wounded more than 100.

The US president said that you "don't start a war against someone 20 times your size" and hope people give you missiles.

Ukraine's Air Force said a new Russian missile and guided bombs targeted the city of Sumy in northeastern Ukraine on Monday evening, a day after a missile strike killed 35 people in the city.

Russia on Monday claimed its deadly missile attack on Ukraine's Sumy that killed and wounded scores including children had targeted a gathering of Ukrainian troops, while European leaders condemned the attack as a war crime.