These satellite photos show Russia committing an act of overt war against Ukraine

The US State Department has released satellite photos that it says prove that Russia is using its artillery to fire into Ukrainian territory at Ukrainian military forces. Ukraine has been claiming for weeks that Russia was firing artillery across its border — an act of overt war — but the US did not confirm it until Thursday.

If true, this would be a major escalation by Moscow; for Russia to use its military openly to attack Ukrainian forces would be a step beyond its prior strategy of sending in unmarked...