What is the Western Warplane Coalition that Ukraine's Zelensky urges to form?

The Russia-Ukraine war continues to intensify. As shelling advances, several Ukrainian regions are fading away. The battle for Bakhmut has proven to be one of the bloodiest & longest battles in Ukraine war. Kyiv's forces have held out against a Russian onslaught with heavy losses on both sides and the city. Ukrainian President Volodymyr Zelensky now seeks to get aid from Western powers.