U.S. Secretary of State John Kerry and his Iranian counterpart Mohammad Javad Zarif met on the sidelines of the Munich Security Conference.

The Washington Post reports that Zarif told world diplomats and security officials that Iran and Western nations were at a “historical crossroads” and beginning to build the trust needed to reach a long-term agreement.

Kerry also stressed the importance of good faith on both sides of the negotiations and the importance of Iran living up to its commitments.

The two sides reached an interim deal in November of last year in Geneva. Zarif said the deal was an “important beginning” and that Iran is prepared to address all questions.

Reuters reports that an unidentified U.S. diplomat said Kerry asked for Iran’s cooperation in the release of detained Iranian-American citizens Saeed Abedini and Amir Hekmati, as well as help in locating U.S. CIA agent Robert Levinson, who has vanished.

The U.S. Department of State has not confirmed these statements.