The supply of shells to Ukraine has decreased by more than 30% since the start of the war in the Gaza Strip. A high-ranking Ukrainian official told ABC News.

"They (US officials) told us that this would not affect the commitments, but it did," the official said.

According to the official, 155 mm caliber shells make up "about 60-70% of total supplies to Ukraine."

A Pentagon representative told the publication that the reduction in ammunition for Kyiv "has absolutely nothing to do with what is happening in the Gaza Strip."

He said that the aid packages "start being put together weeks in advance, so there is no connection between what's happening in Gaza and what's happening in Ukraine."

However, Kyiv is very concerned. "We have big problems...basic ammunition is not coming in," the official said.

The source warned that Ukraine risks losing its positions on the battlefield, which were gained "at a very high cost."