Trump’s frequent criticism of NATO, along with announced troop withdrawals from Europe and a six-month review of the US military presence on the continent, has fuelled uncertainty within the alliance.
The Trump administration has pushed for Europe to boost defence investment and take on primary responsibility for the continent's security.
So, given the context, what can the alliance expect from its upcoming summit in the Turkish capital?
Michał Owczarek put that question to experts at the recent Warsaw East European Conference.