British soldiers are being encouraged to use the Signal messaging app instead of WhatsApp, amid reports that Russian forces used insecure UK numbers to direct airstrikes in Ukraine.
Signal has a higher level of encryption than WhatsApp.
Military sources said that secure channels should be used to discuss sensitive matters but denied that the advice had been issued in response to security breaches resulting from the use of British phones in Ukraine.
There are unconfirmed reports that three British special forces veterans were killed when Russian forces targeted a training camp in western Ukraine last week. At least 35 people died in the cruise missile attack on the Yavoriv base near the Polish border. It had been used by Nato forces to train the
