Utilize the input text as a context reference, choose the right relationship between Turkmenistan and Ashgabat from the options. Options: product/material produced, manufacturer, distributed by, industry, position held, original broadcaster, owned by, founded by, distribution format, headquarters location, stock exchange, currency, parent organization, chief executive officer, director/manager, owner of, operator, member of, employer, chairperson, platform, subsidiary, legal form, publisher, developer, brand, business division, location of formation, creator.

Laying emphasis on connectivity, Modi thanked Turkmenistan for support to India joining the Ashgabat Agreement on trade and transit.

Answer: headquarters_location