Russian forces have launched a wave of daylight attacks on Ukraine, striking a university and killing at least two people.

Anti-drone netting has become an increasingly common tactic to protect key roads, a Ukrainian commander told Business Insider.

A swarm of Russian drones flew last week into Poland in what officials there regarded as a deliberate provocation.

Oil prices rose over a dollar a barrel on Tuesday, as traders weighed the possibility that Russian supplies may be disrupted by Ukrainian drone attacks on its ports and refineries, and awaited the Federal Reserve's decision on U.

Russia denied responsibility, implying that the drones had simply lost their way; NATO and European officials suggested the violation was intentional. Whatever the case, the clash marked the first time that NATO engaged enemies in allied territory.

Moscow claims Nato is ‘fighting against Russia’ after drones enter Romanian airspace - Romania condemned Moscow's 'unacceptable and irresponsible' violation of its sovereignty

Ukrainian drones have struck one of Russia's largest oil refineries, sparking a fire, Russian officials and Ukraine's military said Sunday.

President Trump said he believes the more than three-year war in Ukraine would end if all NATO countries stopped buying oil from Russia and placed tariffs on China for its purchases of Russian petroleum. The announcement came as Romania became the second NATO country to report a Russian drone incursion.