Russia has proposed to the U.S.-led coalition to carry out joint air strikes on Syrian rebels including Nusra Front who are not observing the ceasefire, as of May 25, Russian Defense Minister Sergei Shoigu said, Channel New Asia reported.
Such action would be coordinated with the Syrian government, he told a Defense Ministry meeting broadcast on state television, adding that Moscow reserved the right to stage strikes unilaterally.
Washington has consistently refused to join any operation that is coordinated with the Syrian government, as has been the case with Russia's campaign of air strikes that began in September last year.
Shoigu said joint air strikes should also target convoys carrying weapons and ammunition crossing into Syria from Turkey.
While Russia supports the government of President Bashar al-Assad, the United States - along with its allies in the West and the Gulf - back rebels trying to overthrow him.
However, both sides oppose the al Qaeda-linked Nusra Front, which was not included in a ceasefire deal which has failed to prevent widespread violence.
Shoigu said the proposed joint air strikes would help the stalled peace process.
"We believe the adoption of these measures will allow a transition to a peaceful process to be achieved in the entire territory of Syria," he said. "Of course, these measures have been coordinated with the leadership of the Syrian Arab Republic."
Shoigu said discussions with U.S. military experts based in Jordan and other counterparts in Geneva had begun on Thursday.
But he added: "We reserve the right to start from May 25 unilateral strikes on units of international terrorist groups and illegal armed groups which have not joined the ceasefire."