MOSCOW, May 20 (Reuters) - Russia has proposed to the Unites States and the U.S.-led coalition that they begin on May 25 joint air strikes in Syria, targeting the Nusra Front and other rebels who are not observing the ceasefire, Russian Defence Minister Sergei Shoigu said on Friday.

Russia proposes that these strikes should also target convoys with weapons, including those crossing into Syria from Turkey. He said the proposal had been coordinated with Syria's government and discussed with U.S. military experts in Amman, Jordan.

Russia reserves the right to hit unilaterally those rebels in Syria who do not observe the ceasefire, state television showed Shoigu addressing a Defence Ministry meeting.

(Reporting by Dmitry Solovyov; Editing by Vladimir Soldatkin)

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