PARIS — Serious complications await Ukraine's plan to build a massive new air force comprising large numbers of French and Swedish warplanes. On Monday, Ukrainian President Volodymyr Zelenskyy and his French counterpart Emmanuel Macron signed a letter of intent for the purchase of up to 100 Dassault-made twin-engine Rafale fighter jets over the next decade. The announcement came only a few weeks after Kyiv signed a cooperation agreement with Sweden that includes the procurement of 100 to 150