Democratic Republic of Congo's President Joseph Kabila in a national address says the long-delayed December election is "a matter of sovereignty" but he still doesn't say what role he will play.Kabila's speech to the National Assembly and Senate had been widely anticipated as the opposition worries he will try to stay in power.The president confirmed the December 23 election date, adding that "our commitment to respect the Constitution remains unequivocal."Kabila, upset by what his government has described as meddling by outsiders, said DRC must remain in control of its destiny and will fully fund the elections itself.DRC is "not willing to receive lessons in democracy, especially not of those who murdered democracy in this country and elsewhere," he said.The United States is among a number of Western countries that have expressed concern over delays in the election, which had been scheduled for late 2016.Last week UN Secretary-General Antonio Guterres told reporters that visits by him and other diplomats to DRC had been postponed because Kabila soon would announce "important decisions" and "the president doesn't want to give the impression that he's doing so because of international pressure."Guterres added he would be "very comfortable" with the postponement if it meant the "right decisions" would be announced.It was not immediately clear what effect Kabila's new comments would have.Kabila's mandate ended in December 2016. His government has blamed the delays on the difficulties of organising an election in the vast Central African country roamed by dozens of armed groups. The constitutional court has ruled that Kabila, in power since 2001, should remain in office until the vote, though he is barred from running for another term.Candidates for president must declare by the first week in August.In June the government launched the Common Front for Congo, bringing together a large number of political parties. Kabila is considered its moral authority, and some observers have expressed concern that this is another means for him to assert control.Looking back over his stay in office, Kabila said he had "worked to create favorable conditions for the emergence of a strong and prosperous DRC," adding that what he accomplished once seemed impossible "because we inherited a catastrophic situation."* Sign up to News24's top Africa news in your inbox: SUBSCRIBE TO THE HELLO AFRICA NEWSLETTERFOLLOW News24 Africa on Twitter and Facebook.