Check for the Purchase of Alaska (1868)
EnlargeDownload Link Citation: Cancelled check in the amount of $7.2 million, for the purchase of Alaska, issued August 1, 1868; Records of the Accounting Officers of the Department of the Treasury; Record Group 217; National Archives. The Russian exchange copy of the Treaty of Cession, March...www.archives.gov
I couldn't find a "buy back" clause or reference to a leasehold.
It was a comment on Trump's "unmatched" negotiation skills