Ukraine's fighter jet fleet is slowly growing, but its weapons to bring down Russian jets are dwindling, leaked US document shows

• Poland received permission from Germany to send Ukraine five more MiG-29s this week.
• The jets will bolster Ukraine's fighter fleet, which is still under fire from Russia's larger air force.
• But air-defense ammunition is a more urgent need, one underscored in recently leaked US documents.

Poland received permission from Germany to send five MiG-29 fighter jets to Ukraine this week, bolstering Kyiv's fleet ahead of a season of more intense fighting.

The jets, however, won't tip the scales in the aerial battle between Russia and Ukraine, and they will arrive as Ukraine and its partners scramble to find more ammunition for Ukrainian air-defense weapons, which have been vital to denying Russia's aircraft and missiles the ability to strike at will.