A drone attack launched by Ukraine hit St. Petersburg, Russia, overnight as Russian President Vladimir Putin wraps up an economic forum there.

It's been dubbed Russia's answer to Davos: some 20,000 visitors from over 130 countries have travelled to St Petersburg for President Putin's flagship economic forum.

Ukraine said drones hit an oil terminal and a naval base in Saint Petersburg.

Ukraine's drone attacks on St. Petersburg are deeply embarrassing for Russia and Vladimir Putin in particular.

Ukraine launched drone strikes on Russian military sites near St

Ukraine said the latest strikes hit military and energy infrastructure hundreds of miles from the front lines