Several allies of the US have expressed unease at Washington's decision to supply Ukraine with cluster bombs.
On Friday, the US confirmed it was sending the controversial weapons to Ukraine, with President Joe Biden calling it a "very difficult decision".
In response, the UK, Canada, New Zealand and Spain all said they were opposed to the use of the weapons.
Cluster bombs have been banned by more than 100 countries because of the danger they pose to civilians.
They typically release lots of smaller bomblets that can kill indiscriminately over a wide area.
The munitions have also caused controversy over their failure - or dud - rate. Unexploded bomblets can linger on the ground for years and then indiscriminately detonate.
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