US President Barack Obama and Russian President Vladimir Putin met on Monday to hold talks to end the violence in Syria.

The two leaders spoke on the sidelines of the G20 summit, according to press Secretary of national security Council of the United States. More detailed information on the discussions is expected to be known later. U.S. officials, in turn, said that Ukraine also stood on the agenda for Putin and Obama.

Russian news Agency TASS referring to the press service of the Kremlin, said that the negotiations lasted longer than planned and that the leaders spent most of the meeting discussing Syria.

A U.S. official said that the talks ended between the US Secretary of state John Kerry and his Russian counterpart Sergei Lavrov, who worked to discuss a plan that would increase military cooperation between the two countries in order to better target terrorists and avoid civilian casualties.

But negotiators have not agreed completely, although the talks ended for the moment.
"There are still questions that need to be discussed," said the official representative of the United States. On Sunday, a cautious optimism prevailed about the fact that the deal can be struck between Washington and Moscow, which for a long time could not come to agreement about policy in Syria.
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