Ukraine’s President Volodymyr Zelenskyy meets Donald Trump on Friday to push for more military support at a time when Kyiv and Moscow are escalating the war with massive attacks on energy systems and NATO is struggling to respond to a spate of air incursions, BBC reported.

Since Trump’s summit with Russian President Vladimir Putin in August failed to yield a breakthrough in the US peace push, Kyiv has been hammering Russian oil refineries with drones while Russian strikes have caused major power outages across Ukraine.

NATO’s eastern flank is also on edge after Poland and Estonia said Russia had violated their airspace with drones and jets last month, eliciting denials from Moscow. There have since been other drone incidents in Germany and Denmark, according to BBC.