Mattis stressed the enduring nature of the US-Turkey relationship in a meeting with Yildirim, the AP reported.
In talks that Pentagon chief spokesperson Dana White described as good and calm, the officials reaffirmed their support for peace and stability in Iraq and Syria.
Mattis and Yildirim meet for about 30 minutes before the start of an international conference in London on security threats and humanitarian crises in Somalia.
A senior American official said the US will step up joint intelligence-sharing with the Turks in an effort to help them better target terrorists. The move is part of the assurances to Turkey, which is concerned that the weapons will end up in the hands of its enemies.
US committed to protecting Turkey as NATO ally - Pentagon
12 May 2017
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Washington is committed to protecting Turkey, a NATO ally, Pentagon chief James Mattis said at the meeting with Turkish Prime Minister Binali Yıldırım in London.
