Ukraine's surprise incursion has seen it make advances into territories across the Russian border.

UK-donated Challenger 2 tanks have been used by Ukraine as part of its surprise incursion into Russia, a UK source has confirmed.

The Ministry of Defence is not officially commenting on what specific UK weapons are being used by Ukraine.

However, following Kyiv’s incursion into Russian territory, the ministry reiterated that Ukraine had “a clear right” to use UK-supplied weapons for “self-defence against Russia’s illegal attacks”.