Artillery systems are reportedly being loaded onto trains.
Russia says some of its troops are moving away from the border with Ukraine after they finished exercises in the area.
Video has emerged showing tanks and artillery systems being loaded on to a train.
The United States and the UK have been among the countries which have been warning that the Kremlin could be preparing to invade.
A spokesperson from Russia's foreign ministry says it shows the "Western war propaganda failed."
Jean Monnet Professor of European Integration and Director of the Maynooth Centre for European and Eurasian Studies, Maynooth University spoke with Clem Ryan about the rising tensions on Tuesday Morning's Kildare Today:

Highest Rate Of Inflation Recored Since 2023, According To CSO
Public Sector Strike Called Off After Pay Deal Agreed
Man (52) Found Guilty Of Murdering 89-Year-Old Woman In Tipperary
Dublin City Traffic Restrictions Begin Ahead Of Major Meetings Of World Leaders
Public Sector Talks To Resume At WRC Today, Amid Looming Strikes
Gardaí Call Off Work-To-Rule At Last Minute
Small Parcels Can Now Be Sent Using New Drop-Off Service, With 84 Locations In Kildare
Body Found In Lough Erne Amid Search For Missing Limerick Woman