washington u.s. president donald trump meet russian president vladimir putin next week summit germany bring two world leaders whose political fortunes become intertwine face-to-face first time kremlin white house announce thursday pair meet sideline july 7-8 summit g20 nations hamburg trump national security adviser h.r mcmaster downplay significance meet one nine side meet u.s. president two days different discussions country really mcmaster say specific agenda really go whatever president want talk about meet fraught difficulties trump allegations russia interfere u.s. presidential election last year collude republican campaign overshadow businessman unexpected victory dog first five months office russia unite state also odds ukraine nato expansion civil war syria moscow support president bashar al-assad unite state back rebel group try overthrow assad washington anger russia launch missile strike syrian government air base april response unite state say chemical weapons attack kill dozens civilians trump frequently call good tie russia lawmakers republican party urge wary moscow president make clear like unite state entire west develop constructive relationship russia also make clear necessary confront russia destabilize behavior mcmaster say u.s. intelligence agencies say russia hack leak email democratic party political group help trump win 2016 u.s. presidential election democrat hillary clinton russia deny allegations trump say team collude moscow several congressional committees well fbi investigate russia role election allege collusion trump campaign make optics putin meet particularly challenge trump big grin face picture front page every western newspaper investigation continue say heather conley former state department official george w. bush white house would think president would advise meet careful body language conley tell reuters trump raise russian hackle week white house say appear syrian military prepare conduct chemical weapons attack warn assad force would pay heavy price russian foreign minister sergei lavrov warn wednesday moscow would respond proportionately unite state take measure syrian government force lavrov add would probably right putin trump talk g20 summit world economic power republican bob corker influential chairman senate foreign relations committee describe plan encounter side meet say hop trump would bring problematic issue putin would hope would hand list issue country think may well corker tell reuters putin serve russian president prime minister outlast previous two u.s. presidents george w. bush barack obama officials administrations say american officials initially overestimate potential areas cooperation russian leader combination overconfidence inattention occasional clumsiness washington contribute deep spiral relations moscow say relations reach post-cold war low trump predecessor obama last days presidency obama order expulsion 35 russian suspect spy impose sanction two russian intelligence agencies involvement hack u.s. political group 2016 election propose new package sanction russia u.s. congress might also put curb trump ability pursue warm relations moscow u.s. senate reach agreement thursday resolve technical issue stall sanction although measure fate house representatives uncertain fortunes enmesh trump putin hold first meet next week