The United States has delivered 10 armored vehicles to Ukraine as part of a military support program intended to assist the fight against Russian-backed separatist forces in the country's east.

Ukrainian President Petro Poroshenko said Wednesday at a handover ceremony at Kiev's Borispol airport that more Humvees were to be delivered within 45 days. Poroshenko's office has said the U.S. is set to eventually provide 230 Humvees.

President Barack Obama's administration has said it will provide Ukraine's military with $75 million in nonlethal aid, but has refrained from offering lethal equipment despite calls from Congress to do so.

Fighting has largely abated in east Ukraine, although contained skirmishes still occur. More than 6,000 people have died in the conflict, which started last April.