Lewis Hamilton boosted his morale with the fastest lap in Russian Grand Prix practice on Friday after Mercedes team mate Nico Rosberg set the early pace and Ferrari suffered reliability problems.
The Briton lapped the Albert Park circuit in a searing one minute and 21.164 seconds to cross the line 0.664 seconds clear of Ferrari's Kimi Raikkonen.
Williams defended their young and inexperienced Formula One drivers
Formula One teams say they will race in Russia, despite the crisis in Ukraine and downing of a Malaysian airliner, unless the country's debut Grand Prix in October is called off or they are ordered not to go.