SNIZHNE, Ukraine (AP) — It was lunchtime when a tracked launcher with four SA-11 surface-to-air missiles rolled into town and parked on Karapetyan Street. Fifteen hundred miles (2,400 kilometers) to the west, passengers were checking in for Malaysia Airlines Flight 17.

It had been a noisy day in this eastern Ukrainian town, residents recounted. Plenty of military equipment was moving through. But still it was hard to miss the bulky missile system, also known as a Buk M-1. It left deep tread marks in the asphalt as it rumbled by in a small convoy.