Trump talked to Putin about improving relations, policy in Syria, and “strategic economic issues”.
Wapo: Trump talks to Putin
The uncertainty followed a telephone call Monday between Trump and Russian President Vladimir Putin, during which they agreed that relations between their countries were “unsatisfactory” and vowed to work together to improve them, the Kremlin said in a statement.
Moscow said the two men discussed combining efforts in the fight against terrorism, talked about “a settlement for the crisis in Syria” and agreed that their aides would begin working on a face-to-face meeting between them.
Trump’s office later said that Putin had called to “offer his congratulations” and that they had discussed shared threats and challenges, “strategic economic issues” and the long-term relationship between the two nations.
This appears to be a direct violation of the Logan Act, which “forbids unauthorized citizens from negotiating with foreign governments having a dispute with the U.S.” https://en.wikipedia.org/wiki/Logan_Act