The US has rejected a Russian proposal to carry out joint air strikes against jihadist groups in Syria, saying they have different objectives.<br /><br /> It comes after the Russian Defence Minister Sergei Shoigu called for the two countries to cooperate on military operations to target the groups not observing the US-Russia brokered truce.<br /><br /> “We should start joint actions between the Russian air force and the air force of the US-led coaliton on May 25 and plan and carry out air strikes on targets and units belonging to al-Nusra and other illegal military groups, that do not observe the ceasefire.”<br /><br /> In effect since late February, the truce has led to a decrease in violence, but it is showing signs of crumbling.<br /><br /> A US state department official said that Bashar al-Assad’s forces had been responsible for many ceasefire violations, and called on Russia to put pressure on its ally the Syrian government.<br /><br /> While Russia supports Assad, the US is backing groups attempting to overthrow him in a conflic
