India’s Prime Minister Narendra Modi issued a new warning to China over deadly border tensions on Saturday, using his most important speech of the year to promise to build a stronger military.Modi also told the Independent Day ceremony that India has three Covid-19 vaccines under trial and will ensure a vaccine reaches every citizen, while paying tribute to those fighting the coronavirus pandemic.Attendance at the historic Red Fort in New Delhi for the speech was cut by more than half to 4,000…