India, Sept. 8 -- US President Donald Trump on Sunday threatened to escalate sanctions against Moscow after Russia unleashed its largest aerial assault yet on Ukraine, vowing that a coordinated economic offensive by Washington and Europe could push Russia's economy into "full collapse."

The Kremlin's barrage of missiles and drones on Sunday killed at least four people and set ablaze Ukraine's cabinet of ministers building in central Kyiv - the first time the sprawling government complex has been hit in the three-and-a-half-year conflict. Emergency services reported damage to high-rise buildings and dozens wounded, including a pregnant woman who delivered a premature baby shortly after the attack.

"This is a deliberate crime," Ukrainian ...