Russia's drone incursion into Poland underscores Moscow's growing willingness to test NATO's resolve and raises the risk of an escalation that could edge both sides closer to direct confrontation. In the early hours of Sept. 10, Russian drones entered Polish territory during an attack on Ukraine, which Ukrainian President Volodymyr Zelensky said involved some 415 drones and 40 missiles. Warsaw estimates that 19 drones crossed into its airspace, of which four were downed. The defensive operation was carried out jointly by Dutch F-35s and Polish fighters, with Italian airborne early-warning aircraft providing surveillance support and German Patriot missile systems placed on standby. Polish authorities reported that one drone traveled roughly 250 kilometers (155 miles) within Polish territory before crashing in a field near Mniszkow in the Lodz region, while another drone fragment was recovered in Czosnowka, about 50 kilometers from the Belarusian border. Although no casualties were reported in...