Lord Cameron said the sanctions against Russia "have had an effect" on the Russian economy as they are struggling to get access "to some key technologies." Mr Cameron was speaking to the United Nations General Assembly in New York on the eve of the second anniversary of the invasion where he warned of the consequences of withdrawing support for Ukraine.
It comes as both the US and the UK have announced new sanctions against Russia over its invasion of Ukraine and the death of opposition leader Alexei Navalny.
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