The South Koreans are developing their own 4.5th-generation fighter jet called the KAI KF-21 Boramae, which highlights the fact that there will be demand for 4.5th-generation fighter jets for years to come. Observers state that the KF-21 could enjoy considerable export potential in the coming years. While some countries like the United Kingdom are now focused on procuring 5th-generation fighters and developing 6th-generation fighters, others are only now upgrading to older F-16s (like Ukraine, Romania, Argentina, and possibly Brazil).