One Russian and one American plane have carried out a "planned communications test" in the skies over Syria, US officials say.
The Pentagon said the test lasted around three minutes and was designed to "validate the safety protocols" agreed last month.
Last month both countries' planes entered the same "battle space" and came within miles of each other.
After this a deal was signed to avoid clashes between the two air forces.
The test was conducted in "south central Syria" and "assured that the first time this mode of communication was used would not be during an unplanned encounter," a Pentagon statement said.
A senior Russian military official said the test was designed to "to train crews and ground services for incidents of dangerous proximity of aircraft".
In September, Russia started carrying out air strikes against rebels in Syria, after Damascus suffered a string of defeats at the hands of both rebel forces and the Islamic State (IS) group.
Earlier on Tuesday the Russian foreign ministry said it was not crucial for Syria's President Bashar al-Assad to stay in power, saying it was up to the Syrian people to decide.
However, a spokeswoman for the ministry said that this did not represent a change of position.
When asked if saving the Syrian leader was a matter of principle for Russia, spokeswoman Maria Zakharova said: "Absolutely not, we never said that."
Russia is supporting the Syrian government with air strikes on rebels.
Russia is seen as one of Mr Assad's strongest backers. His future is seen as a key sticking point between those backing rival sides in the conflict.
The US has said Mr Assad can have no part in Syria's political future.
Earlier on Tuesday, Russian Deputy Foreign Minister Mikhail Bogdanov said that Moscow was aiming to host a round of talks between Syrian government officials and members of the country's opposition in Moscow next week.
Last week world powers - including key Assad ally Iran for the first time - met in Vienna and agreed to renew efforts to end the conflict.
The ministers agreed to ask the United Nations to start a process that could lead to a ceasefire and new elections. New talks are due in two weeks.
BBC
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