Prince Harry, who was twice deployed to Afghanistan, said in a statement provided by his spokesperson that the sacrifices of NATO troops deserve respect.
Two German fighter jets were scrambled to the Romanian-Ukrainian border on Tuesday night in response to a Russian drone attack in the frontier region.
Russian President Vladimir Putin's continued refusal to accept a ceasefire is "complicating" efforts to reach a peace deal, Ukrainian President Volodymyr Zelenskyy said.
Polish and Swedish military aircraft were scrambled in response to a large Russian drone and missile attack launched across Ukraine on Sunday night.
NATO leaders were gathering in the Netherlands on Tuesday for the start of a historic two-day summit that could unite the world's biggest security organization around a new defense spending pledge or widen divisions among the 32 allies.
President Trump and his NATO counterparts are due to gather Tuesday for a summit that could unite the world's biggest security organization around a new defense spending pledge or widen divisions among the 32 allies.