The world this week -- PoliticsPolice investigating the murder of a Conservative MP in Britain were treating the incident as an act of terrorism.Sir David Amess, who represented the town of Southend, to the east of London, was stabbed to death while holding one of his weekly consultations with constituents.The suspect is a 25-year-old man born in Britain to a Somali family.He had reportedly once been referred to a programme that tries to turn youngsters away from radicalisation.The European Parliament awarded its annual Sakharov prize to Alexei Navalny, Russia’s leading opposition figure, who has been imprisoned after surviving an assassination attempt by Russian agents.Ursula von der Leyen vowed that the European Commission will punish Poland after its constitutional court, acting on a legal request from the prime minister, ruled that parts of the EU treaties are not compatible with Polish law.The commission president’s threat is directed against Polish access to some 57bn euros ($66bn) in funds for recovery from the pandemic.A primary involving members of six opposition parties in Hungary chose Peter Marki-Zay, the mayor of a small town, as their joint candidate to take on Viktor Orban, the prime minister, in elections due next spring.