Why has India abstained on the UNSC resolution on Russia in Ukraine?

Why has India abstained on the UN Security Council resolution condemning the Russian invasion of Ukraine?

EDIT:
The Finantial Times published India sticks with Russia after Vladimir Putin’s invasion of Ukraine on the India stance, some details mentioned there:

• India depends on Russia for crucial commodities such as energy and fertiliser
• Russia’s support is seen as vital to managing India’s unresolved confrontation with China on its northern Himalayan border
• the Soviet Union is credited as having helped India win its 1971 war with Pakistan over Bangladesh
• India might not want to push Putin to further strengthen his alliance with China
• some 65 per cent of arms transferred to India between 1950 and 2020 were from the Soviet Union or Russia