NATO Secretary-General Jens Stoltenberg warned Tuesday about an increased chance of an accidental Russian strike on a neighboring NATO nation, calling for additional air defense in Europe. The United States has already sent batteries of Patriot surface-to-air missiles to Poland’s border after Russia invaded Ukraine in late February. “We are ready to protect and defend every inch of NATO allied territory,” Stoltenberg told reporters Tuesday. But warned, “When we see more military activities, when we see actually fighting going on close to NATO borders, there’s always a risk for incidents and accidents.” Because of the heightened risk, “we have to make every effort to prevent such incidents and accidents and if they happen, to make sure that they don’t spiral out of control and create really dangerous situations,” he added. Days before that, authorities in Croatia, also a NATO ally, said a Soviet-era unnamed vehicle crashed near its capital Zagreb …