One of many is making friendship with Awami League instead of BANGLADESH, and engineering the political situation in BD using BAL to suppress BNP and its allies.
Governments will always make relationships with governments. The people of India (Bengalis) will form relationships with Bangladeshis.
The Bangladeshi people voted in the BAL Government, it is an immense snook to BD sovereignty if the GoI bypassed them and delved into the internal politics of the country.