LONDON — An international court today ordered Russia to pay more than $50 billion to the former majority shareholders of now-defunct oil company Yukos, ruling that the state engaged in a ruthless campaign to destroy what was once the country’s biggest oil producer. In one of the biggest such cases ever, the Permanent Court for Arbitration in the Hague, Netherlands, determined Russia was not acting in good faith to collect taxes when it leveled massive claims against Yukos in 2003, even though some of the …