Ukraine’s security service released footage Wednesday of its attack on Russian war planes at multiple airbases across the country. In the span of a few hours on Sunday, nearly a third of Moscow’s strategic bomber fleet was destroyed or damaged with cheaply made drones sneaked into Russian territory, according to Ukrainian officials.

Ukrainian President Volodymyr Zelenskyy is applying more pressure on President Donald Trump to increase the cost of what he sees as Russian obfuscation.