The law would tackle fake accounts on platforms such as Meta's Facebook and Twitter that were set up on behalf of foreign states to influence elections or court proceedings
A moratorium on the death penalty has been in place in Russia since 1997, but this is not the case in the two separatist territories of eastern Ukraine.
Ukrainian troops will be trained on how to use the launchers in the UK, so they can "maximise the effectiveness of the systems", Britain's defence ministry said.
McCallum said that after Al-Qaeda's plane hijackings of September 11, 2001, the threat had evolved with the so-called Islamic State group inspiring followers into extremism online.