PMQs: Cameron and Miliband on Russian troops in Ukraine
5 March 2014 Last updated at 12:54 GMT
David Cameron said Russia's action over Crimea in Ukraine are "completely unacceptable" and he called for direct talks.
Ed Miliband said there was "no reason for Russia to believe that strengthening ties between Ukraine and the EU" would be at Russia's expense.
Last week, there were no questions on Ukraine, but all of the exchanges between the two main party leaders were about Russia and Crimea this week.