One of President Vladimir Putin's top economic officials on Wednesday pushed back at U.S. President Donald Trump's warning that the Russian economy was going to collapse amid lines for gasoline in some regions.

President Ahmed al-Shara is making his first trip to Moscow, which backed the regime his rebels overthrew. Both sides have reasons to put the past aside.

A representative of Ukraine's state-owned rail company said the attacks coincide with Russia's "dramatic increase" in drone production.