Ukraine Conflict Ignites Fears Over Cyber War

As Putin bulks up Russian troops at the Ukrainian border, national security experts warn that the Russians may target key digital infrastructure.
Russia has attacked Ukraine with more than 30 strikes, Ukrainian military says
Ukraine has been hit with more than 30 strikes on civilian and military infrastructure by Russia, its military says.

That includes, it says, with cruise missiles.

The president's office also says that there is heavy fighting going on in the east of Ukraine, along its border with Russia, including in places like Kharkiv.

It comes as Russian forces say that Ukrainian border guards have left their posts.