In the letter addressed to the Uttarakhand Chief Secretary, Doval compliments him 'in handling the situation during Kumbh Mela'.
The discussions between the US Defence Secretary and the NSA would be the first major interaction between the two sides during the visit.
Official sources said China figured in the talks in the larger context of geo-political developments, and in relations to the strategic interests of India and the US in the Indo-Pacific region.
The two sides held extensive conversations on issues of strategic mutual interest, including on synchronising efforts to combat terrorism and build peace
The two sides, led by NSA Ajit Doval and French government advisor Emmanuel Bonne will hold discussions on wide-ranging bilateral and global issues.
Vivek Doval had filed a criminal defamation complaint against the Caravan Magazine and Ramesh for allegedly defaming him through an article and a press conference based on it respectively.
Ajit Doval calls on Sri Lankan president Gotabaya Rajapaksa, discusses ways to 'deepen' bilateral ties
Doval and Rajapaksa had a 'productive' discussion with him on the ways to diversify and deepen the bilateral relationship.
Sri Lanka is hosting the fourth trilateral meeting on maritime security cooperation with India and the Maldives.
Doval's talks with Didi was part of a trilateral maritime dialogue among India, Sri Lanka and the Maldives being held here in the Sri Lankan capital.
NSA Ajit Doval meets Sri Lankan PM Mahinda Rajapaksa, talks on bilateral ties with defence secretary
Sri Lanka will host the fourth national security advisor trilateral meeting on maritime security cooperation with India and Maldives on Friday and Saturday.
Doval and Maldivian defence minister Maria Didi are expected to lead their respective delegations and there will be observers from Bangladesh, Mauritius and Seychelles.
Four Pakistan-based Jaish-e-Mohammad terrorists were killed and two policemen injured in a gunbattle in Nagrota on Thursday after a truck carrying newly infiltrated militants was intercepted.
Vivek Doval was being examined in the defamation case filed by him against Congress leader Jairam Ramesh, The Caravan Editor-in-Chief Paresh Nath and reporter Kaushal Shroff.
Delivering the Sardar Patel Memorial Lecture, Doval claimed that in the past four years, the country's 'national will' has been aroused.
Governor ESL Narasimhan meet National Security Advisor Ajit Doval on PM Modi's advice as TDP ups the ante
Narasimhan's talks with Doval come in the wake of Chief Minister N Chandrababu Naidu's comments insinuating that he was uniting the Opposition and behaving like an agent of the BJP.