BRUSSELS—The United States, the European Union, Britain, and Canada joined forces Monday to impose sanctions on several senior officials in Belarus over the forced diversion to Minsk of a passenger plane travelling between two EU countries last month. Asset freezes and travel bans were also imposed on a number of officials linked to the security crackdown that continues to rock the country some 10 months after President Alexander Lukashenko was returned to power in elections branded by the EU and others as “fraudulent.” “We are united in our deep concern regarding the Lukashenko regime’s continuing attacks on human rights, fundamental freedoms, and international law,” the four said in a joint statement. “We are committed to support the long-suppressed democratic aspirations of the people of Belarus and we stand together to impose costs on the regime for its blatant disregard of international commitments,” they said. The EU hit seven people and …