Rishi Sunak has mentioned the UK "discourages" using cluster bombs after the US agreed to ship them to Ukraine.
President Joe Biden has confronted criticism for supplying the munitions, that are banned by many allies due to their observe document of killing and maiming civilians.
The prime minister mentioned the UK was one in every of 123 nations that signed a conference banning their use, and would proceed specializing in supplying tanks and long-range weapons to assist the struggle in opposition to Russia.
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He added: "We will proceed to do our half to help Ukraine in opposition to Russia's unlawful and unprovoked invasion, however we have accomplished that by offering heavy battle tanks and most just lately long-range weapons, and hopefully all nations can proceed to help Ukraine.
"Russia's act of barbarism is causing untold suffering to millions of people. It's right that we collectively stand up to it."
Mr Sunak will meet Mr Biden in London on Monday forward of a NATO summit.
Cluster bombs detonate within the air and launch "bomblets" that scatter over a big space.
Opponents say they kill indiscriminately and that a number of the smaller munitions can fail to detonate, posing a long-term danger to civilians.
Mr Biden has known as it a "difficult decision" however mentioned he needed to act as "the Ukrainians are running out of ammunition".
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The US says Kyiv has offered assurances it won't use cluster bombs in city areas however some NATO allies are more likely to be uneasy over their provide.
Ukrainian President Volodymyr Zelenskyy thanked the US for the "timely, broad and much-needed defence aid package" that may "bring Ukraine closer to victory over the enemy, and democracy to victory over dictatorship".
The Convention on Cluster Munitions prohibits their use or stockpiling due to their indiscriminate impact on civilian populations.
The US, Ukraine and Russia usually are not signatories.
Both Moscow and Kyiv have used cluster munitions to date within the warfare.
Commons Defence Committee chairman Tobias Ellwood urged the US to "reconsider".
The Tory MP tweeted: "This is the wrong call and will alienate international good will.
"Their use leaves lethal unexploded ordnance over the battlefield, killing & injuring civilians ."
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