In Geopolitics, There are Only INTERESTS, NO FRIENDS.
It’s a myth that Russia is a friend. When it comes to War, no country is a friend. At the end of the day, every country thinks of their own interests first. If you say Russia sells weapons to India and will always save us, but please note that Russia also sells advanced weapons to our enemy China.

Russia and China are revitalising defence ties at a time when relations of both with the U.S. have run into rough waters
The dragon (china) gets a bear hug.
So, is really Russia our friend ? Israel has became India’s most important partner in arms bazaar with around $10 bn business.
$10 bn business: How Israel became India’s most important partner in arms bazaar
Israel supplied us laser guided bombs and Bofors at a later stage when other countries did not give us these weapons. And it is well known that NATO and Israel are under big boss, US influence. During 1999 Kargil war, Russia and NATO had refused to give laser guided missiles and bombs, due to which we were forced to send our soldiers to climb up hill and face enemy at the top of the hill and thus our many soldiers died.
During War, even if Russia, NATO gives us weapons and spare parts, they will increase their price manifold. Or they can sell the kill switch (radio switch) to our enemy so that the enemy can deactivate our weapons.
See the issue with high altitude due to lack of LGB technology and how Mirage 2000 LGB kit parts were supplied with incorrect parts due to India’s Pokhran II test which Russia didn’t like.
https://web.archive.org/web/20160303204929/https://www.bharat-rakshak.com/IAF/History/Kargil/1056-PCamp.html
Also our LGB manufacturing capability is also sub-par.
In short, it is a folly to blindly trust any country that it will save us, without paying it a heavy price, without any interests of its own.
So no excuse on indigenous manufacturing, which we are light years behind.