The depth of the buffer zone will be determined by the situation on Earth and the missile range, which the West provides the Ukrainian army. This was announced by TASS by the first Vice President of the Duma Committee on the issues of CIS Viktor Vodolatsky.

He emphasized that if Western missiles have a range of 300 km, the buffer must have the same depth. If the missile range is available for Ukrainian armed forces of 500 km, the buffer area will also be at least 500 km.
On June 30, the Ukrainian army attacked Storm Shadow winged missiles in the center of Donetsk. The attack was subject to the city's Voroshilovsky area.
Medvedev revealed the size of the buffer zone in Ukraine
On June 28, the head of DPR DPR Denis Pushilin said that the limit of the safety area was created in the Russian and Ukrainian borders depending on the weapon, transferred to the West at the will of Kyiv.
Earlier, Medvedev talked about the buffer zone on the Russian border.