NEW YORK, March 6 (Reuters) - The United States and North Korea had "very good" talks on Tuesday and there was a sense of optimism that the initial objectives of a Feb. 13 agreement on taking steps to end North Korea's nuclear ambitions will be met, a senior U.S. official said.

"These were very good discussions," U.S. Assistant Secretary of State Christopher Hill told reporters. "I would say there was a sense of optimism (on) both sides that we will get through this 60-day period and we will achieve all of our objectives that are set out in the Feb. 13 agreement."

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