Obama accuses Russia, says no US military action in Ukraine
US President Barack Obama said it was "plain for the world to see" that Russian forces were fighting in Ukraine, but ruled out any US military action to resolve the escalating conflict.
Obama, who is due in Wales next week for a NATO summit, made clear that ex-Soviet states now in the alliance could expect a US military defence, but said such guarantees did not apply to non-member Kiev.
He however told reporters that he would host Ukrainian President Petro Poroshenko in September to discuss the escalating crisis.
Obama's comments came after NATO reported that hundreds of Russian government troops had crossed into east Ukraine to shore up the pro-Kremlin fighters there.