Britain could deploy more forces to bolster NATO's presence in the Baltic states amid tensions with Russia, the Defence Secretary has said.
Michael Clarke, the former director of the Royal United Services Institute (RUSI), told Forces News if the UK sent additional troops anywhere, it would be "as a symbolic reinforcement to some of our NATO partners".
He added the three countries being discussed are Romania, Bulgaria or Hungary - with reinforcement coming from potentially both the US and UK.
The other option is for Britain to send extra troops to Estonia, with the UK already leading one of four multinational battle groups on Europe's eastern flank.
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"Doing more of the same in the Baltics may not carry as much symbolic weight as sending some fresh troops, as it were," Mr Clarke said:
Which regiments would be deployed by the UK isn't clear, with speculation it could be personnel from the new Army Ranger Regiment.
However, the Ministry of Defence (MOD) has yet to confirm any details.