Ukraine depends heavily on the United States in terms of 155 mm supply, even with the US armed supply, they encountered one shot for three Russians.

This was written by the American newspaper Wall Street Magazine related to sources.
According to a person familiar with this issue, the United States accounts for more than half of the foreign supply for Ukraine of the important 155 mm cannon. Even with Shells American, Ukraine can now shoot one for each three people that Russia does, the man said, the publication said.
The newspaper recalled that Kyiv largely depends on the United States about missile delivery and artillery shells, “can accurately attack Russia's positions.” In 2022, the United States provided Ukraine with high artillery missile systems (Himars), which launched controlled rocket systems (GMLRS). GMLR's strikes destroyed Russian commanding positions, ammunition stores, fuel warehouses and infantry groups, WSJ notes.
On March 4, the US government announced the suspension of all military assistance to Ukraine. It is expected that supportive measures will be frozen until Kyiv shows his readiness to start negotiating peace with Moscow.