"Poland supports Ukraine in its efforts to prevent Russian aggression," the spokesman, Piotr Müller, said in a tweet on Saturday.
"Prime Minister Mateusz Morawiecki will meet with the Ukrainian president and prime minister in Kyiv on Tuesday," he added.
"We will do everything possible to maintain peace in Europe," Müller also tweeted.
His announcement came after Polish lawmakers this week adopted a resolution to support Ukraine amid the threat of a new Russian invasion.
The resolution, which was approved by the Polish lower house on Thursday, called on NATO and the European Union to offer more “comprehensive support” to Ukraine amid intensifying tensions with Moscow.
It condemned Russia for undermining peace in Europe and breaking international law.
The resolution was approved almost unanimously, with 456 votes in favour and only one opposing, state news agency PAP reported.
Earlier this week, Polish President Andrzej Duda told reporters that NATO was united in its support of Ukraine amid a standoff with Moscow.
He was speaking after a video call on Monday with US President Joe Biden and the leaders of France, Germany, Italy, Britain and the European Union.
Duda last week met with Ukrainian President Volodymyr Zelensky in the southern Polish resort town of Wisła to discuss regional security and the risk of further Russian aggression against Kyiv.
He declared after those talks that Ukraine "can count on Poland's support" in the event of a Russian attack.
Polish Deputy Foreign Minister Szymon Szynkowski vel Sęk has said in a media interview that Ukraine "has a right to choose its alliances" and that "there is no return" to the kind of world order based on spheres of influence that existed in the Cold War days.
Russia's deployment of troops near Ukraine has raised fears in the West that Moscow, which seized Ukraine's Crimea peninsula in 2014 and has since backed separatists fighting in eastern Ukraine, may be poised for a new attack, the Reuters news agency has reported.
Russia has denied plans for an assault but says it could take unspecified military action if its security demands are not met, according to Reuters.
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Source: PAP