France has signed a letter of intent to support the Serbia鈥檚 Belgrade metro project, reports.

French president Emmanuel Macron signed the letter while on a visit to the country. It opens the possibility of an intergovernmental agreement with regards to the financing of the infrastructure project, which is estimated to cost around 鈧�4 billion.

The planned transit system in Serbia鈥檚 capital will comprise two lines, one 22km long and the other 19.8km, which will integrate four of Belgrade鈥檚 urban rail lines.

The letter of intent comes just two months after French engineering company Egis completed a feasibility study of the proposed metro.

Serbia has also signed an agreement with China鈥檚 Power Construction Corporation (Powerchina) regarding the metro project. As part of the agreement, the two will work in a joint capacity on the project鈥檚 documentation, spatial plans and financing model.