Ukraine has been asking for long-range missiles for months, but support from Britain and other allies such as the United States was previously limited to short-range weapons.
Wallace told parliament: “We simply will not sit idly by while Russia kills civilians. Russia must realize that its actions alone led to the supply of such systems to Ukraine.”
He added that Britain was supplying Ukraine with these weapons so that they could be used on its territory.
The Kremlin said earlier that if Britain supplied the missiles, it would require an “appropriate response from our military”.
Britain and other Western countries have stepped up military aid to Ukraine this year.
Wallace and British Foreign Secretary James Cleverly have traveled to the United States for talks on support for Ukraine in recent weeks.
The war in Ukraine has reached a turning point, as Kiev is set to launch its new counterattack after 6 months of keeping its forces on the defensive, while Russia has launched a massive winter offensive that has failed to seize vast territories.
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