MOSCOW (Reuters) - Russian President Vladimir Putin and U.S. President discussed the civil war in Syria on Tuesday, with Putin stressing the importance of finding a political solution to the conflict after meeting with Syria s president. Trump and Putin spoke by telephone for about an hour, covering topics including Syria, Ukraine, Iran, North Korea and Afghanistan, a White House official said earlier. Their conversation came after Putin hosted Syrian President Bashar al-Assad for three hours of talks on Monday, in preparation for a push by Moscow to end Syria s conflict now that Islamic State has been driven out of its self-styled caliphate in Iraq and Syria. According to Kremlin, Putin told Trump that the  Syrian leader confirmed adherence to the political process, to run a constitutional reform and president and parliament elections .  The message was sent of the necessity to keep the sovereignty, independence and territorial integrity of Syria and to reach a political settlement based on principals to be worked out in a full-scale negotiation process in Syria,  the Kremlin said. On Wednesday, Turkish President Tayyip Erdogan and Iranian President Hassan Rouhani - whose countries back opposing sides in the Syria conflict - will travel to Russia for a meeting with Putin aimed at advancing the Syrian peace process. Putin stressed the importance to Trump of what he called  coordinating of efforts between the special services of both countries . The two leaders also discussed North Korea,  stressing the expediency of finding the ways of solution by the diplomatic means .  