“We agreed to seek solutions on the S-400” issue, Erdogan told parliament in Ankara on Tuesday, referring to the missiles. Most of the problems between Turkey and the U.S. consist of “minor complications,” he said.

The remarks suggest Erdogan remains confident his personal rapport with Trump will ward off punitive actions against Turkey.

The Russian S-400 system, which Turkey began purchasing earlier this year, was designed to shoot down U.S. and allied aircraft at greater ranges and altitudes than older missiles. U.S. officials are concerned that sensitive technology in its advanced F-35 fighter plane designed to evade such a system could be compromised and used to improve Russian technology if Turkey has both.