US President Joe Biden said he had a "very good meeting" with his Turkish counterpart Recep Tayyip Erdogan on Monday.
Biden's remark came after meetings between the Turkish and US delegations that started following the bilateral talk of the leaders.
The one-on-one meeting at the NATO headquarters lasted for 45 minutes. The two leaders met for the first time since Biden took office in January.
The NATO summit, gathering heads of member states and governments, has begun on Monday in Brussels.
The NATO leaders have been holding bilateral meetings on the sidelines of the summit.
Before meeting with Biden, the Turkish president has also met other world leaders during the summit, including German Chancellor Angela Merkel, French President Emmanuel Macron, and British Prime Minister Boris Johnson.