BERLIN >> Friedrich Merz plunged straight into international crises on his first full day as Germany’s new chancellor Wednesday, presenting a united front with France against U.S. President Donald Trump’s trade war, demanding more aid for Gaza and announcing he soon would visit Ukraine.

Merz and French President Emmanuel Macron — firm believers in the European Union and leaders of the continent’s largest economies — used their first meeting since the German leader’s appointment Tuesday to show unity on Ukraine and other issues causing alarm in Europe. They vowed to strengthen the continent’s security and increase defense spending.

The tandem of Germany and France has long underpinned the 27-nation bloc, but lost some of its vigor in recent months as leaders in both countries wrestled with domestic issues.

In a joint news conference, Merz acknowledged that Europe still needs the U.S. for peace in Ukraine. “It is our firm conviction that we cannot end this war in Ukraine without further political and military engagement by the United States of America,” he said. “The Europeans cannot replace this at present.”

Both Trump and Russian President Vladimir Putin have been exerting pressure on the EU, forcing it to rethink its own security. It was not clear when Merz would visit Ukraine.

Macron said that France and Germany will “accelerate” defense cooperation, including jointly developing new defense technologies “necessary for the wars of tomorrow.” He listed working together on tanks, long-range missiles and combat aircraft. He also said that the countries would start regular meetings of a French-German defense council.

Merz also visited Poland on Wednesday and addressed his new government’s plans to station more police at Germany’s border to curb illegal migration and even turn away some asylum-seekers.

“If we, everybody together in the European Union, give the signal to those who are setting out for Europe without valid opportunities for entry, if we give this signal especially to the traffickers, that these routes are going to get a lot more difficult and that we are going to close them, then that is a joint and good signal,” Merz said during a joint news conference with Polish Prime Minister Donald Tusk.

Merz and Macron also demanded that Israel allow humanitarian aid for civilians in Gaza. Israel cut off all aid to the territory over two months ago to try to pressure the Hamas militant group.

Israel is preparing to ramp up its campaign against Hamas in a devastating war now entering its 20th month. The war began on Oct. 7, 2023, when Hamas-led militants attacked southern Israel, killing 1,200 people and taking 251 hostages.

Israel’s offensive has killed more than 52,000 people in Gaza, many of them women and children, according to Palestinian health officials, who don’t distinguish between combatants and civilians in their count.

Merz urged Israel to be “more responsible” — striking comments given Germany’s past and present support for Israel.

Macron said that France couldn’t, on the one hand, defend Ukrainians’ sovereign and territorial rights while ignoring the plight of Palestinians in Gaza, saying: “We cannot have double standards.”

Both men sought stability between India and Pakistan, saying they view the latest exchange of fire “between these two nuclear powers with the utmost concern.”

India fired missiles into Pakistani-controlled territory early Wednesday, killing at least 31 people in what Pakistan’s leader called an act of war. India said it struck infrastructure used by militants linked to last month’s massacre of tourists in the Indian-controlled portion of Kashmir.

The German leader’s trip to Paris came the day after his historic defeat in the first round of voting in the German parliament. No other postwar candidate for chancellor has failed to win on the first ballot. He won in the second.

Traditionally, newly elected chancellors make a point of visiting their big neighbors in the west and east on the first day in office to stress European unity.