The Dnipro will likely freeze over in the next few weeks. With thick enough ice you can drive a tank across praying that AUF won't break up the ice with artillery as did the Finns when Stalin sent tanks over the Gulf of Finland during the Winter War.
Tankers would do well to don drysuits and scuba equipment. Then the only problem is finding a gap in the ice overhead as long as they land right side up on the bottom.