Russia's military could be unable to operate the high-tech weapons and communications systems it has been using in Ukraine if the West were to tighten export controls, says a report.

Almost all Moscow's modern military systems depend on western-made microelectronics, according to UK think tank The Royal United Services Institute (Rusi).

Researchers for Rusi spent months in Ukraine, examining 27 of Russia's most modern military systems, either captured, brought down or abandoned by Russian troops.

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