Is Trump losing patience with Putin? Will sanctions against Russian oil giants hurt Putin? Ukraine has hit back at Russia's attempts to disable its energy infrastructure with air strikes that succeeded in disrupting power and heating in two cities across the border. Alexander Gusev, regional governor of Voronezh, said several drones were electronically jammed over the city - home to more than one million people - and sparked a fire at a local utility facility that was quickly extinguished. A Russian Defence Ministry statement made no mention of either the Voronezh or Belgorod areas, reporting 44 Ukrainian drones were destroyed or intercepted by Russian forces during the night.

Every day, billions of people use the GPS satellite system to find their way around the world--but GPS signals are vulnerable. Jamming and spoofing attacks can cripple GPS connections entirely or make something appear in the wrong location, causing disruption and safety issues. New data analysis reveals that multiple major Russian cities appear to have faced widespread GPS disruption during the past week. The signal interference follows Ukraine launching long-range drone attacks deep into Russian territory, and it may act as a way to potentially stop drones that rely upon GPS for navigation, experts say. The GPS interference has "expanded on a scale that hasn't been seen before," says Erik Kannike, a program manager at Estonian defense intelligence firm SensusQ who has been monitoring the situation.