Mr Sergey Mashonsky > Arzinger & Partners > Minsk, Belarus > Lawyer Profile

Arzinger & Partners
12 Sovetskaya str., office 36
220030, Minsk

Work Department

Foreign Investments & PPP, Policy & Regulatory


Sergey Mashonsky is the Senior Partner with Arzinger & Partners. He is strongly recommended for his expertise in legal regulation of investment projects’ implementation in Belarus and public-private partnership projects, including project financing.


From 1991 to 2004, Mr. Sergei Mashonsky worked at state government bodies, including Ministry of Economics, Ministry of Foreign Economic Relations, Ministry of Foreign Affairs of the Republic of Belarus, at diplomatic and consular service. For several years, he performed the functions of the Secretary of the Currency and Credit Committee of the Council of Ministers. He worked as part of practice and expert groups of state authorities of the Republic of Belarus on drafting of legislative acts, participated in development and signing of a number of international treaties. In 2018, he was elected as Independent Director and member of the Supervisory Committee of the ASB Consult company.


Belarusian, Russian, English, Slovak, Czech, Ukrainian


Mr. Mashonsky is in the task force for formation of the favourable investment image of the Republic of Belarus abroad with the Advisory Council for Foreign Investments with the Council of Ministers of the Republic of Belarus. He is a member of the task force for development of amendments and supplements to the Law of the Republic of Belarus “On Public Private Partnership”. Mr. Sergei Mashonsky is an expert of the Eurasian Economic Union (EAEU) Court for review of disputes in application of anti-dumping, compensatory and special protective measures that represents the Republic of Belarus.


Belarusian State University – 1990; Russian Academy for Foreign Trade with the Ministry of Economic Development of Russia

Lawyer Rankings

Belarus > Banking, finance and capital markets

(Leading individuals)

Sergey MashonskyArzinger & Partners

Lawyers at Arzinger & Partners ‘combine a very high degree of professionalism and market knowledge with outstanding individual skills and client focus’. Sergey Mashonsky heads the practice alongside Juri Slepitch and his ‘experience is valued in ‘solving complex situations’. He recently acted for Svetlogorsk Pulp and Board Plant on the financing of an investment project for the construction of a new bleached sulphate pulp plant in Belarus. The team is praised as ‘a great partner for foreign clients’ and acts for both domestic and international entities, including MasterCard, Belarusbank and Triniti Invest. Senior associate Maksim Slepitch is ‘a highly motivated, skilled and brilliant lawyer’, who is ‘able to carry out complicated and complex projects’.

Belarus > Commercial, corporate and M&A

(Leading individuals)

Sergey MashonskyArzinger & Partners

The team at Arzinger & Partners ‘has the highest level of integrity, transparency and interest in helping clients’. Maksim Slepitch is the go to name for corporate matters while ‘experienced business lawyerDmitry Viltovsky handles mergers and acquisitions. Sergey Mashonsky is ‘an expert in investment matters’ and leads on foreign investment and PPP mandates. Recent highlights include advising Belarus-based start-up Y-Tech on its acquisition of American streaming service Yonder Music and representing MED VR, a virtual reality start-up consisting of doctors and software engineers, on structuring its corporate entity and shareholder agreements. Klim Stashevsky, who is an expert in international trade and was recently promoted to partner, has the ‘widest range of necessary skills’.

Belarus > Dispute resolution

(Leading individuals)

Sergey MashonskyArzinger & Partners

Arzinger & Partners’ team consists of ‘dispute resolution lawyers who know everything there is to know about commercial litigation in Belarus’. The practice is jointly headed by Alexander Korsak and Elena Mashonskaya and is particularly active in handling litigation related to investment projects. It recently represented Eckart at the International Arbitration Court at the BelCCI in a dispute concerning partial payment for supplied goods. In another highlight, the team acted for Viktoriya in a debt recovery dispute with an Italian company that was resolved in an Italian court. Korsak is ‘a standout litigator’, who ‘combines impressive technical skills with pragmatism and common sense’. Sergey Mashonsky is highly recommended and is praised as ‘a very tough negotiator‘. Associate Maria Golovko has experience handling equipment supply and administrative relations disputes.