President George W Bush has said the US will use military aircraft and naval forces to deliver aid to Georgia following its conflict with Russia.
He also urged Russia to respect a ceasefire agreement with Georgia.
President Bush said the US was concerned about reports of continuing Russian military action in Georgia.
US Secretary of State Condoleezza Rice is to fly to France for talks with Nicolas Sarkozy before travelling to Tbilisi to express US support, he said.
He said he would direct US Defence Secretary Robert Gates to begin a "vigorous and ongoing" humanitarian mission to Georgia, headed by the US military.
"We expect Russia to honour its commitment to allow in all forms of humanitarian assistance," Mr Bush added.
Mr Bush's address in Washington came amid reports that violence has flared in Georgia, where Russian tanks have been seen patrolling the town of Gori, near the breakaway region of South Ossetia.
The US president said Russia's ongoing actions had "raised serious questions about its intentions in Georgia and the region".
US forces to deliver aid to Georgia
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