Good morning. Among the many troubling aspects of the recent spikes in military tension between Russia and Nato, the most disquieting may be this: it’s uncertain which event could tip the balance and ignite a larger crisis. Russia has carried out a number of airspace violations in recent weeks, prompting growing concern. Initially using drones and later fighter aircraft, it appears that Moscow is testing how much pushback it might face from Ukraine’s allies. “We hope this reckless pattern