Direct proof of use
Direct public evidence for the 5.56x45 mm cartridge in the 2014 Russia-Ukraine War comes from Canadian government records for small-arms ammunition supplied to Ukraine. On April 11, 2023, the Prime Minister of Canada announced a Colt Canada package for Ukraine that included 21,000 5.56 mm assault rifles and more than 2.4 million rounds of ammunition to support those weapons and small arms already in service with the Armed Forces of Ukraine.
Canada's Department of National Defence later stated that 1 million rounds of 5.56 mm ammunition and 4,800 assault rifles were scheduled for delivery to Ukraine in the weeks after the May 25, 2023 Ukraine Defense Contact Group meeting. Canada's running military-support page records the broader April 2023 small-arms package as delivered and sourced through the Canadian Commercial Corporation.
Sources: Canada April 2023 Ukraine Support, Canada May 2023 Ukraine Military Aid, Canada Military Support to Ukraine
Timeline
The documented sequence begins with Canada's April 2023 announcement of the Colt Canada small-arms package, continues with the May 2023 delivery update that singled out 1 million rounds of 5.56 mm ammunition, and later expands into additional Canadian small-arms-and-ammunition funding. The later Canadian records do not identify every cartridge type in every package, but they show that 5.56 mm ammunition remained part of Canada's Ukraine support portfolio.
Sources: Canada April 2023 Ukraine Support, Canada May 2023 Ukraine Military Aid, Canada December 2025 Estimates Note
Narrative
The 5.56x45 mm cartridge appears in the conflict record as part of Ukraine's NATO-standard small-arms supply rather than as a separately reported battlefield incident. Canada's April 2023 package tied the ammunition to 5.56 mm assault rifles from Colt Canada and to small arms already used by the Armed Forces of Ukraine, placing the cartridge in the infantry and unit-level ammunition supply chain.
Canada's public support ledger lists the April 2023 small-arms-and-ammunition package as delivered and valued at about $59 million. A later Canadian parliamentary note described a two-year, $100 million effort to deliver small arms and ammunition, including 5.56 mm and 7.62 mm rounds, blank training rounds, and M4 carbines, and characterized the effort as supporting Ukraine's transition to NATO-standard weapons.
Sources: Canada Military Support to Ukraine, Canada December 2025 Estimates Note
