Tillerson used a G20 gathering in Germany to hold a series of meetings with his global peers, reviewing crises from North Korea to Ukraine at a time of great uncertainty over President Donald Trump's "America First" strategy.
Washington's top diplomat joined a group of countries who support the Syrian opposition for talks on a way to end the nearly six-year war.
"All the participants want a political solution because a military solution alone won't lead to peace in Syria," German Foreign Minister Sigmar Gabriel told reporters in Bonn, adding that "Tillerson became very involved in the debates".
Diplomats had said before the talks that they were hoping for clarity on whether there had been a change in US policy on Syria, particularly on the future of President Bashar al- Assad.
The meeting came ahead of a new round of United Nations-led talks in Geneva on February 23 involving Syrian regime and rebel representatives.
Under Trump's predecessor Barack Obama, Washington insisted Assad had to go, putting it at odds with Moscow which has launched a military intervention in support of the Syrian leader.
With Russia's sway in the conflict growing, it has seized the initiative by hosting separate peace talks in Kazakhstan along with Turkey, brokering a fragile six-week-old truce on the ground.
Gabriel said the "like-minded" countries had agreed to step up pressure on Russia to back a political solution and reaffirmed there could be no alternative to the UN-led Geneva talks.
"There should not be any parallel negotiations," he said.
French Foreign Minister Jean-Marc Ayrault, speaking alongside Gabriel, said a key stumbling block was Russia's insistence to consider all opposition groups as "terrorists".
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