Kharkiv, which is Ukraine's second largest city and is the biggest population center closest to Russia's border, has been plunged into total darkness Sunday night amid alleged Russian attacks on key infrastructure sites, including large power stations."The center of Ukraine’s second city Kharkiv was plunged into darkness on Sunday evening by an electricity blackout," Reuters has confirmed of the large-scale outage. It's further being reported that some city districts are also without water, creating a severe crisis for residents."The cause and extent of the blackout in the northeastern city were not immediately clear. There were also unconfirmed social media reports...