U.S. officials say they have come up with no hard evidence that Soviet troops are returning to Afghanistan, despite a statement Saturday from Pakistan's President Mohammad Zia al-Haq.

The officials did tell The Associated Press on however, that the Soviets would have difficulty meeting the Aug. 15 deadline for withdrawing half their 115,000 troops in Afghanistan.State Department spokesman Charles E. Redman said Monday, "We fully expect the Soviets to honor their obligation under the Geneva accords, . . . and we'll continue to watch the situation carefully."

Redman said the United States had received assurances from Moscow "that they intend to meet their Afghan accord responsibilities."