SINGAPORE (Reuters) - U.S. Secretary of State Mike Pompeo said on Monday the ultimate objective of a historic summit with North Korea had not changed and the United States was eager to see if North Korea was sincere about denuclearization.

U.S. President Donald Trump holds a summit with North Korean leader Kim Jong Un in Singapore on Tuesday with their talks expected to center on ending the Norths nuclear weapons and missile programs in return for diplomatic and economic incentives.

Pompeo said Trump was fully prepared for the talks, and was optimistic that the outcome would be successful, while warning that there was still lots of work left to do.