The US is calling on India to reconsider its plan to purchase advanced missiles from Russia.

They want India to switch to American systems instead and have been touting the “strategic importance” of the relationship between Washington and New Delhi.

Press TV reports:  “If we want to see that continue and I think both we and our Indian friends want to do that, then it’s incumbent on us to give them the best case and hopefully that will engender a willingness on the part of the Indian government to think about our systems as they go forward in their procurement,” Tina Kaidanow, principal deputy assistant secretary of the State Department’s Political-Military Affairs Bureau, told reporters, according to Defense One.

India and Russia reportedly concluded price negotiations for procurement of five regiments of Russian-made S-400 advanced air defense systems last month.

The final contract is expected to be signed during a summit meeting between Indian Prime Minister Narendra Modi and Russian President Vladimir Putin in October.

The United States has also been trying to reach out to India as New Delhi deepens its defense ties with Moscow.

In recent weeks, the US military renamed its Pacific Command the US Indo-Pacific Command, in a symbolic move underscoring “India’s rise and role in regional and global security.”

Kaidanow was in New Delhi last month for what she called “exceptionally good, very, very productive conversations” with Indian officials.

They reportedly discussed US sanctions against Russia, which also cover Almaz-Antey, the manufacturer of the S-400 surface-to-air missile system being purchased by India.

“The acquisition of these systems is…beneficial to the Russian government,” Kaidanow said. “Our distinct hope is that other countries will take that into account as they make their decisions.”

The US Congress passed the Countering America’s Adversaries Through Sanctions Act (CAATSA) against Russia in August 2017 over allegations of interfering in the 2016 presidential election.

India’s plan to buy 110 fighter jets in the coming years has also prompted American aircraft manufacturers Lockheed Martin and Boeing to offer Indian assembly lines for F-16 and F/A-18 jets.

“American defense product is great product — it is the best in the world,” Kaidanow said. “It’s central that countries really think about when they acquire these things — and particularly when we’re talking about important systems like fighters — that they think about the quality and the interoperability piece and all of the things that we know come with the acquisition of American products.”

The US has also sparred with Turkey over its procurement of advanced missile systems from Russia.