The government is considering sending hundreds more British troops to Afghanistan, the BBC understands.
The defence secretary has written to Theresa May recommending the UK boosts its military presence in the country – but no decision has been made.
The UK currently has more than 600 troops in capital Kabul helping train Afghan security forces.
It follows calls by US President Donald Trump and Nato for allies to join him in sending more troops to the country.
BBC defence correspondent Jonathan Beale said he understood that Defence Secretary Gavin Williamson recommended sending up to 400 more army personnel into Afghanistan, joining the 600 already there training Afghan soldiers.
The UK troops would help train Afghan forces and not be in combat.
Any announcement was likely to coincide with the Nato summit in July, our correspondent added.
In 2017, the US announced a plan to send in thousands more troops, which would bring the US total to about 15,000.
It is part of a strategy to help fight the Taliban and deal with the rising threat from the Islamic State group.
The last UK combat troops left Afghanistan in 2014…