WASHINGTON — Since it first emerged that Michael T. Flynn had repeated phone conversations last December with Russia’s ambassador to the United States, one of the most significant unanswered questions has been what transition team officials and Donald J. Trump, then the president-elect, knew about the calls.

The documents made public on Friday show that the transition team knew that Mr. Flynn was going to be discussing sanctions with the then ambassador, Sergey I. Kislyak, and raise new questions about what President-elect Trump knew about the conversations.

Here are some key dates around the conversation and the subsequent fallout that offer insight on what the transition team knew at the time:

Dec. 29, 2016: Flynn Consults With Transition Team, Then Calls Kislyak