NATO allies are particularly wary of being pulled directly into the hostilities, which could dramatically raise the risk of a nuclear war. However, as the fighting has progressed, many donor governments have shed their reluctance to give Ukraine more sophisticated assets, such as battle tanks and modern fighter aircraft. In the summer of 2023, the United States agreed to allow its European allies to provide Ukraine with U.S.-made F-16s. Belgium, Denmark, the Netherlands, and Norway have collectively pledged more than eighty F-16s, some of which have been delivered.

NATO allies are particularly wary of being pulled directly into the hostilities, which could dramatically raise the risk of a nuclear war. However, as the fighting has progressed, many donor governments have shed their reluctance to give Ukraine more sophisticated assets, such as battle tanks and modern fighter aircraft. In the summer of 2023, the United States agreed to allow its European allies to provide Ukraine with U.S.-made F-16s. Belgium, Denmark, the Netherlands, and Norway have collectively pledged more than eighty F-16s, some of which have been delivered.