Mateusz Morawiecki was speaking after the end of Polish-Ukrainian intergovernmental consultations in Kyiv on Wednesday, Poland's PAP news agency reported.
Poland became the first country to hold such wide-ranging cross-government talks with Ukraine since the Russian invasion began in late February, officials said.
New Polish-Ukrainian treaty?
At a joint news conference with his Ukrainian counterpart Denys Shmyhal, Morawiecki announced that the two governments had signed memorandums on cooperation in various policy areas.
He said: “Perhaps these documents will pave the way for a new Polish-Ukrainian treaty that we’ll be discussing in the coming weeks and months.”
Moscow is 'terrified of Polish-Ukrainian relations'
“I believe that Moscow is increasingly terrified of Polish-Ukrainian relations - of the way they are growing,” Morawiecki added.
He told reporters that “Poland is a true friend for Ukraine, and Ukraine is a true friend for Poland.”
Poland to lobby EU to grant Ukraine candidate status
Morawiecki also vowed that “Poland will do everything to convince the European Union to grant Ukraine candidate status” to join the bloc.
“If it was up to us, Ukraine would enter the EU very quickly,” he said.
Poland, Ukraine to produce arms together
Meanwhile, Ukraine’s Shmyhal announced that the two governments had agreed “to set up a Polish-Ukrainian joint venture to produce weapons and military equipment.”
Poland’s conservative leader and Deputy Prime Minister Jarosław Kaczyński said that the two delegations had explored “a whole range of issues” from culture to internal affairs and the economy.
He said that both sides agreed there was an opportunity “to build a strong connection between the Polish and Ukrainian peoples and states.”
Besides the intergovernmental meetings, Morawiecki and Kaczyński held talks with Shmyhal and Ukrainian President Volodymyr Zelensky, the PAP news agency reported.
Wednesday was day 98 of Russia’s invasion of Ukraine.
Source: IAR, PAP, gov.pl