Russian servicemen sit in the cabins of S-400 missile air defence systems in Tverskaya Street before a rehearsal for the Victory Day parade in central Moscow [File: Tatyana Makeyeva/Reuters]

Russia and Turkey are working on a contract for the delivery of a new batch of Russian S-400 missile systems, according to a senior official at a Russian military cooperation agency.

The latest development, reported by the Interfax news agency on Friday, comes after US President Donald Trump said at a recent NATO meeting in London that Washington was considering sanctions against Ankara over purchasing the system.

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“We are looking at it now, and we’re talking about it now,” Trump told reporters. “As you know Turkey wanted to buy our Patriot system and

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