Touching on the U.S. F-35 fighter jet program, Demir said: "As an ally, we find it difficult to understand the U.S.' attitude."
Following Turkey's decision to buy Russian S-400 defense systems, the U.S. suspended Turkey from the F-35 program.
"As a partner in the F-35s, we stand behind our commitment. We insist that a biased decision is unlawful," he stressed.
The U.S. claimed that the Russian S-400 would compromise security on the F-35s, but Turkey said these fears were baseless, and has proposed setting up a commission to clarify the issue.
