Russian drones, jet fighters and other aircraft have increasingly intruded into NATO airspace. In recent months, Russian drones flew deep into Poland, warplanes violated Estonia’s airspace for 12 minutes and Denmark spotted unidentified drones over its main air force base. President Trump has said that European members of NATO should respond with force.WSJ analyzes how Russia is pushing NATO’s boundaries and the bloc’s strategic options to respond. Chapters:0:00 Russia pushing NATO’s boundaries0:28 Timeline of events 2:19 NATO’s response 4:17 What’s next?News ExplainersSome days the high-speed news cycle can bring more questions than answers. WSJ’s news explainers break down the day’s biggest stories into bite-size pieces to help you make sense of the news.#Russia #NATO #WSJ