Portable weapons, such as air-defense systems Stinger and anti-tank systems Javelin, were expected to serve as instruments of underground resistance, the newspaper said.
Ukraine ran out of artillery ammunition almost completely for a few days in mid-March, but their fight beyond expectations "caused a scramble" in Washington and prompted a boost in arms supplies, according to the report.
Russia launched a special military operation in Ukraine on February 24 in response to calls by the Donetsk and Lugansk People's Republics for protection from Ukrainian troops. The Russian Defense Ministry said the goal of the operation, which targets Ukrainian military infrastructure, is to "demilitarize and denazify" Ukraine, and to completely liberate Donbas.
In April, Russia sent a diplomatic note to all countries on the issue of arms supplies to Ukraine. Foreign Minister Sergey Lavrov noted that any cargo containing weapons for Ukraine will become a legitimate target for Russia.