"If we want to avoid the worst, that is war, we have to act according to the old rule: 'If you want peace, prepare for war,'" Jaroslaw Kaczynski said.
"If you see that a patient is getting better and no longer needs intravenous injections and other things, just send him home," Lukashenko said.
Top officials from the Baltic states told Newsweek that Moscow and Minsk are weaponizing vulnerable migrants.
President Alexander Lukashenko claimed victory for a sixth presidential term, but the election was marred by claims of widespread voter fraud.
So far this month, there have been 6,700 hindered attempts to cross the border into Poland, and 18,300 so far this year, Poland's Border Guards Agency said.
Belarus Interior Minister Ivan Kubrakov said the agreement's suspension is a "temporary measure" and could be resolved "after relations normalize."
Poland and Lithuania have been seeing high numbers of migrants, many from Iraq and Afghanistan, seeking to cross their borders through Belarus.
The president said the proposed changes "are aimed at making the Constitution more harmonized and balanced by redistributing the powers of the president, the parliament and the government."
As migrants are reportedly forced to camp on the border for weeks and five migrant deaths were confirmed, human rights activists call Polish response inhumane.
Jailed Belarus opposition leader Maria Kolesnikova awarded human rights prize
European Union officials have urged Poland to offer more aid and assistance to migrants attempting to cross the border from Belarus.
"Groups of people have become stranded for weeks, unable to access any form of assistance, asylum or basic services," a joint statement from two U.N. agencies said.
Poland said a migrant influx at its border with Belarus is part of a plot by Belarus and Russia against the EU as the nations seek to destabilize the bloc.
Belarus and Russia are planning to hold joint war games that start next week, and are set to involve about 200,000 troops.
An interfaith coalition called on the Polish government to offer aid to the people stuck at the border, who "suffer from hunger, cold and indifference."
"The government's priority is the safety of Polish citizens," the Defense Ministry said in a statement.
President Joe Biden signed an executive order targeting President Alexander Lukashenko over an ongoing "assault against the democratic aspirations and human rights of the Belarusian people."
Russia is set to participate next week in the Zapad-Interaction 2021 drills with China involving more than 10,000 troops, and another Zapad exercise next month with Belarus including more than 12,800 personnel.
Tsimanouskaya became an international focus on Sunday when she accused Belarusian officials of removing her from the Olympics and attempting to put her on a plane back to Belarus after she criticized the team's management on social media.
Vitaly Shishov had been reported missing from his home in Kyiv after he did not return from a run on Monday.
Krystsina Tsimanouskaya was granted a humanitarian visa after she was removed from her Olympic team and officials tried to fly her back to Belarus against her will.
Krystsina Tsimanouskaya said she was removed from the national team and forcibly taken to the airport because she "spoke...about the negligence of our coaches."
Sviatlana Tsikhanouskaya said the sanctions are key to transitioning from President Alexander Lukashenko's administration to one supported by pro-democracy proponents.
Crackdowns on civil society activists and journalists have led to the arrest of hundreds of people who oppose Belarus' president.
"Don't hesitate in putting sanctions on the cronies of the regime, on the wallet of the regime, to stop this violence as soon as possible," Sviatlana Tsikhanouskaya said.
"Nine people broke into our apartment, seized all the equipment and took Aleh away in handcuffs," Maryana Hruzdzilovich, one journalist's wife, told the AP.
"This is an extreme situation. This is not a normal migration... It is a hybrid war against us, so the response must be adequate," said Interior Minister Agne Bilotaite
Belarusian authorities raided offices and homes of human rights activists and journalists to crackdown on non-governmental organizations accused of fomenting unrest.
Lithuania's growing dispute with Belarus caused Lithuania to build a fence along the border.