The Ministry of Defense of Belarus reports that a 'build up' of the air defense forces of the 'regional Russian-Belarusian group of forces' has been carried out "Anti-aircraft missile units advanced to designated areas and took up combat duty" 

Germany has made it clear that the Patriot air defence units it offered to Poland are intended for use on NATO territory, countering demands by Warsaw for the system to be sent to Ukraine - Reuters  https://foxdeo.com/5Zve.tnk

Belarus is deploying special operations forces on the border with Ukraine  https://foxdeo.com/KHb.tnk