What Zapad 2025 meant for Belarus and its neighbours
A look back at the final day of the Russian-Belarusian exercise and the diplomatic moves that surrounded it.
What was happening on the Belarusian frontier on 16 September 2025, the last day of the Zapad 2025 exercise? The Russian-Belarusian joint strategic drills ran from 12 to 16 September in Belarus. They were the first Zapad exercise since Russia's full-scale invasion of Ukraine in 2022.
A scaled-down format
Belarus said the drills would test the defensive readiness of the Union State. Main activities were staged at central training areas near Barysaw, with a reciprocal movement of units between the two states. Authorities described a scaled-down format, with locations deeper inside Belarus.
Poland's response
On 11 September 2025, ahead of the exercise, Poland indefinitely closed its border with Belarus and deployed 40,000 troops to it. Warsaw cited security concerns over the Russian-Belarusian exercises near the region, the first of their kind since 2022. The decision tied a military event directly to the management of a border.
A parallel track with Washington
The same day brought a different signal. Following the release of political prisoners, the United States lifted its sanctions on the Belarusian flag carrier Belavia. Minsk therefore faced pressure from one neighbour and a partial easing from Washington within hours of each other.
The contrast is the main point of the period: the drills were presented by Belarus as defensive, Poland treated them as a security matter serious enough to close the frontier, and the US moved on sanctions after prisoner releases. The exercise ended on 16 September 2025.
