British spies reportedly monitored the Russian invasion of Ukraine by tracking Vladimir Putin's soldiers who were using dating app Grindr and other social networking sites.
Russia launched its invasion of Ukraine 11 days ago and UK spies are said to have been increasingly certain of Putin's plans after tapping into social media messages.
The intelligence services gave the information to Ukraine to help in anticipation of a full-scale invasion, only keeping back some details to protect sources and methods.