The Russian S-400 missile defence system has NATO allies worried [Tatyana Makeyeva/Reuters]

US politicians pressed the Trump administration to impose sanctions on Turkey over its purchase of a Russian missile defence system, saying the failure to do so sends a “terrible signal”.

A key Senate committee is set to vote on additional legislation to punish Ankara this week.

“The time for patience has long expired. It is time you applied the law,” Democratic Senator Chris Van Hollen and Republican Senator Lindsey Graham said in a letter to Secretary of State Mike Pompeo.

“Failure to do so is sending a terrible signal to other countries that they can flout US laws without consequence,” they said.

Ankara and Washington have been at loggerheads over NATO

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