Wiley Rein represents London-based Trident Foundation, which says it supports a free, independent, democratic and prosperous Ukraine.
Its work includes providing political consulting services to former prime minister Yulia Tymoshenko, who unsuccessfully ran for president in 2010 and 2014.
She heads the center-right Fatherland political party, which holds the most seats in Ukraine's dysfunctional parliament.
Wiley Rein's agreement runs from March 1 through December and carries a $55K monthly retainer plus expenses capped at $3K per-month.
Trident is a non-profit group of Ukrainian businesses, aiming "to build the capacity of government systems and institutions" to promote human rights, freedom of religion/speech/assembly, and respect for free enterprise and individual privacy, according to the federal filing.
Wiley Rein will support those goals via legislative, regulatory and legal representation.
The firm also will educate the US Congress regarding the need for international financial assistance for Ukraine.