WILLIAM BRANGHAM: There is# more fallout from a Russian## missile strike in Northeast Ukraine# that killed dozens of civilians on## Palm Sunday.

Ukrainian President Volodymyr# Zelenskyy called Russia filthy scoundrels,## while President Trump blamed both Ukraine# and Russia for the start of the war.

Nick Schifrin reports.

NICK SCHIFRIN: In a shattered Sumy# today, sorrow is stated with flowers,## with childhood comforts, and with profound# grief of 20-year-old student Anisia Yaluzhko.

ANISIA YALUZHKO, Sumy Resident (through# translator): It hurts.

Every Ukrainian is hurt.

It## hurts.

It's scary to be here, but there's nowhere# else where I can find myself.

This is my home.

NICK SCHIFRIN: Yesterday, on Palm Sunday, a# Russian weapon designed to target infantry## hit the heart and mind of this city.

A# camera attached to a Ukrainian police## officer walking through destruction that# included a college found the dead among## the dust and debris and families alive, but# traumatized, others, an unspeakable loss.

In total, at least 35 killed, some inside their# cars burn beyond recognition.

The Russian cluster## bomb also ripped through a bus, where 13-year-old# Karilo Ilyashenko (ph) and his mother survived.

WOMAN (through translator): It all# happened so fast.

It got so dark when## the explosion happened.

Glass shattered# into our faces.

We touched each other,## but couldn't see each other, as it was still dark.

DONALD TRUMP, President of the United# States: I think it was terrible.

And## I was told they made a mistake.# But I think it's a hor.. NICK SCHIFRIN: Last night, President Trump# suggested the attack was inadvertent.

QUESTION: You mean it was unintentional?

DONALD TRUMP: They made a mistake.

BAIBA BRAZE, Latvian Minister of# .. what they were doing.

Th.. NICK SCHIFRIN: But, in Brussels# today, unanimous European horror.

RADOSLAW SIKORSKI, Polish Foreign Minister:# I hope that President Trump and the U.S.## administration see that the leader# of Russia is mocking their goodwill,## and I hope the right decisions are taken.

NICK SCHIFRIN: Just three days# ago, Trump envoy Steve Witkoff## held his hand to his heart as he met# Russian President Vladimir Putin.

Today, President Trump for the first# time accused Putin of launching the war,## but also falsely accused Ukraine of provoking it.

DONALD TRUMP: Biden could have stopped# it and Zelenskyy could have stopped it,## and Putin should have never# started it.

Everybody's to blame.

QUESTION: Have you spoken to President Zelenskyy,## sir, about his offer to purchase# more Patriot missile battles?

DONALD TRUMP: You don't start a war# against somebody that's 20 times your size,## and then hope that people give you some missiles.

NICK SCHIFRIN: That ambiguity has# challenged Ukrainian President## Volodymyr Zelenskyy's faith in U.S.# support, as he told CBS' 60 Minutes.

QUESTION: Does the United States have your back?

VOLODYMYR ZELENSKYY, Ukrainian# President (through translator):## Even in this pause of mine, there's a problem,# because I want to answer truthfully and quickly## that the United States is our strategic,# strong partner.

But the pause is doubt.

NICK SCHIFRIN: Today, Russian# Foreign Minister Sergey Lavrov## claimed the target in Sumy was legitimate.

SERGEY LAVROV, Russian Foreign Minister# (through translator): There was yet## another mob up of the Ukrainian military# commanders and their Western colleagues.

NICK SCHIFRIN: But, in Sumy today, there is# no evidence of that.

And as the U.S. pushes## peace, Russia continues its attacks.# Ukraine has no choice but to suffer,## no choice but to clean up the pieces.

For the "PBS News Hour," I'm Nick Schifrin.