Nato leaders plan to turn their attentions to the conflict in Afghanistan, on the second day of a summit so far dominated by demands from President Donald Trump,BBC reports.
Mr Trump on Wednesday urged Nato allies to commit 4% of their annual output (GDP) to military spending.
He also singled out Germany for criticism over its defence spending.
Nato leaders are hoping for a more conciliatory tone on Thursday before Mr Trump leaves for the UK.
But in a late-night tweet from Brussels, the US president reiterated his criticism.
"Billions of additional dollars are being spent by NATO countries since my visit last year, at my request, but it isn't nearly enough," he declared.