New Delhi, Jan 25 (ANI): Experts reacted on Sunday after US President Barack Obama arrived in India for his three-day visit. External Affairs Expert Sheel Kant Sharma said that the relationship between the two countries is very vast and comprehensive. External Affairs Expert K P Fabian said that America is looking for geo- political ally in India. Former Foreign Secretary Shashank said that January is a hectic month for US President and appreciated Obama for taking out time to visit to India. US President Barack Obama and First Lady Michelle Obama on Sunday reached New Delhi for a three day visit. Prime Minister Narendra Modi himself went to receive Obama at the Palam Airport where Air Force One aircraft of United States landed.