The North Atlantic Treaty Organization, which will kick off a summit in Warsaw on Friday, is set to authorize the presence of a NATO force of up to 4,000 troops in the Baltic, the Wall Street Journal reports.
The US and its allies are casting a wary eye on Russia and its reaction to the planned deployment, the paper said.
The Warsaw summit is being described by some observers as the most important gathering of NATO since the end of the Cold War, as it will formalize a more wary approach to Russia.
The summit in the Polish capital will be attended by US President Barack Obama, among other Western leaders.
For weeks, US and allied officials have speculated how Russia will react to the bolstered NATO presence in Estonia, Latvia and Lithuania, the Journal said.
Some officials believe Moscow could simply highlight or expand its long-planned fall military exercises.
Alternatively, Russian President Vladimir Putin could make a more dramatic move and position short-range ballistic missiles into the exclave of Kaliningrad or in Russian-occupied Crimea.
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