For those interested to learn from another example, of a major and more powerful neighbour leasing military ports and coastal lands, should read about the Kharkiv agreement between Ukrainian and Russia on Crimea Ports and what happened eventually to all of Crimea.
Powerful countries do not just give up coastal areas and military ports, even if they initially agreed to a lease, and if needed they even annex the whole region, as happened with Crimea.
Kharkiv Pact - Wikipedia
EN.M.WIKIPEDIA.ORG
Putin tears up lease for Sevastopol naval base
WWW.FT.COM