I served something like four years or so in the then West Germany and I was only present once during a Soviet defection.
The two Red Army formations facing us were 3 Guards Army and 7th Shock Army, 18 Divisions plus support against our four in BAOR. One hot summers Sunday, a T64 MBT came careering out of the wood line, zigzagging across the wheat field. I requested weapons free permission and provided the RA with the appropriate x-ray grid. I was told to, "wait out". The distance from their wood line to ours was nearly 4K but, it crashed into the trees about 300 metres to our left and, the crew poured out. They were howling drunk.
It took a couple of days but Intelligence got back saying they had been expecting something over the weekend but had no specifics thus, no warning order. Hence, no weapons free permission either. Apparently, the 7th Shock Army had received their quarterly black boot polish bulk allocation the day before. A troop of three tank crews had placed their blocks of boot polish on loafs in direct sunlight, the industrial alcohol percolated into the bread and, they consumed it. An hour later, three of them decided on the mazy run. The others were blind drunk, literally.
I suspect I have just contravened the Official Secrets Act?