Western officials have been considering sending combat aircraft to Ukraine for several weeks, despite the US's public refusal to do so. Last month, Poland and Slovakia announced that they would send Soviet-era MiG-29 fighter jets to Kyiv. However, Denmark's acting defense minister emphasized that Denmark will not act alone and that a decision will be reached in conjunction with several other countries. The leaked documents paint a grim picture of Ukraine's air defense supplies and suggest that they may only last a month.

Denmark, which has more than 40 American F-16s and is looking to replace its fleet with 27 US F-35s, is among the countries that could potentially provide Ukraine with modern aircraft. However, concerns remain over the authenticity of the leaked documents, which suggest that Ukraine's S-300 air defense systems could run out of ammunition by May 2. These missile systems reportedly make up 89% of Ukraine's air defense capabilities, although the Pentagon has not confirmed these predictions. Kyiv has accused Russia of falsifying and leaking the documents to discredit counteroffensive ideas and turn Western support away from Ukraine.