By Trevor Hunnicutt, Aftab Ahmed and Manoj Kumar WASHINGTON/NEW DELHI (Reuters) -U.S. President Donald Trump on Wednesday imposed a 25% tariff on goods imported from India starting August 1, as well as an unspecified penalty for buying Russian arms and oil - moves that could strain relations with the world's most populous democracy.

The new order on tariffs will take effect from August 7 and will range from 10% to 41%, depending on the country, while others not mentioned in the list will face a default import duty of 10%.

The White House could be aware that the dramatic shock of tariffs has less power to sway trade deals when staged a second time.