Wrong.. there are 2 method to handle defense. 1. military 2. diplomacy. Ukraine failed in diplomacy so they are suffering. Israel wins wars against bigger countries because of diplomacy. Israel enjoys high diplomatic relations with the US so they support them militarily, politically and financially. No matter how big air force we have, we cannot win an air war due to numerical advantage of INdia.... But we can create good diplomatic channels with India, China, Russia and the US to prevent such an invasion. We can also build a larger army and trained civillians so even if they invade, it'll be difficult to keep us under control.. Just like what Russia is facing in Ukraine.. We also have to have a stronger diaspora in the world, in places like UN to bring us diplomatic support.. It's an all round strategy basically..