LONDON (Reuters) – British Prime Minister Boris Johnson will not be distracted from focusing on tensions between Ukraine and Russia by receipt of a police questionnaire about lockdown parties at his Downing Street office, a government minister said on Saturday. The Metropolitan Police are contacting more than 50 people believed to have attended the parties to explain their involvement. On Friday, Johnson’s spokesperson confirmed he had received a questionnaire and would respond as required. “I’ve every confidence that the prime minister will fill out this questionnaire and return it to the Met…