Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: Video footage of Russia's latest arms race has emerged - in a test of speed featuring two tanks. Soldiers in the rebel held city of Luhansk, in Eastern Ukraine, pitted a Russian T-72 tank against a captured Ukrainian T-64 Bulat - with a predictable outcome. After driving to a farmer's field, the Russian built machine, made in 1986, was put up to race against the fully loaded Ukrainian weaponry, which had been modernised in 2005. The contest, which took place over a distance of 402 metres, was filmed by drones as well as from inside the losing tank. The resulting video, complete with musical accompaniment, was placed on YouTube.Each tank had three crew and full combat load during 402 metre raceThe contest was filmed by a drone and from inside the Ukrainian tankUkrainian sources say its tank had been fitted with extra-heavy armour 
 Question:Over the course of the unusual drag race, the T-72 can be seen clearly outpacing the heavier _ armoured vehicle.

Ukrainian