Royal Air Force (RAF) Typhoon fighter jets and a Voyager tanker were deployed overnight from the United Kingdom to patrol Polish airspace as part of NATO's new Eastern Sentry mission, according to the UK Defence Journal. The deployment follows recent Russian airspace violations near Estonia and drone incursions into Poland and Romania. The Eastern Sentry mission aims to bolster NATO's presence and security along its eastern flank in response to escalating tensions. The specific timing of the RAF deployment was overnight, between September 19th and September 20th, 2025. This action underscores NATO's commitment to collective defense and its efforts to deter further aggression in the region. The mission is a direct response to the aforementioned airspace violations and incursions, which have heightened security concerns among member states.