Just what could Russia be sending into Eastern Ukraine on 260 trucks? Humanitarian aid? Troops? Military supplies? Best guess? What would benefit Russia most? As long as Russia can keep everyone’s attention on Donetsk then Crimea will be ignored. So it would be something to support the terrorists in the East.
How and what is being sent to the terrorists? Well, I am reminded of the joke about the man who was crossing a border every day. Everyday the guards checked the manure in the wheelbarrow, and found nothing. Day, after week after months. Eventually someone asked the man what he was smuggling across the boarder. His answer was “wheelbarrows”.