Poland should not rule out sending troops to Ukraine, foreign minister Radoslaw Sikorski said in comments published today.
It comes as Kyiv struggles to repel Russian advances in eastern Ukraine.
Mr Sikorski did not specify what role Polish troops would play in the conflict.
Ukraine's NATO allies have vowed to supply the beleaguered nation with weapons and money for as long as it takes to fend off Russia's invasion, but they have generally ruled out the possibility of sending soldiers.
Asked in an interview whether Poland was ready to send troops to Ukraine, Mr Sikorski said: "We shouldn't rule it out. We should leave Putin guessing as to our intentions".
The interview was published in Poland's Gazeta Wyborcza, Italy's La Repubblica and Spain's El Pais.
Previously, French President Emmanuel Macron suggested Western troops could help with the training of Ukrainians in Ukraine.
