Russia has been showing off a new 'deadly weapon' at a major arms fair in Moscow - but it's actually just a modified robot dog from China.

The M-81 robot dog, which is armed with an RPG-26 rocket launcher has been dubbed "essentially a toy" and can be bought for $2,700.

In a Telegram post, its modification designers commented: "This is a sample of the M-81 robotic system, capable of conducting aimed shooting and transporting weapons."

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