President Donald Trump warned a cheering Polish crowd on Thursday about a 'steady creep of government bureaucracy,' throwing shade in German Chancellor Angela Merkel's direction before he departed Warsaw for Hamburg.

Trump is consistently critical of overgrown governments and has privately carped to White House aides about a stranglehold Berlin has on the rest of the European Union.

He left Warsaw for Hamburg shortly after his address in Warsaw, where a tense meeting with Merkel – a cheerleader for Europe's civil-service red tape – is sure to be coming.

Trump put government overreach in the same category as other destructive influences like Islamic terrorism and the last century's Nazi regime.

'We put faith and family, not government and bureaucracy, at the center of our lives,' he said of the United States.

Bureaucracies are 'firmly within our control,' he said. 'This danger is invisible to some but familiar to the Poles: the steady creep of government bureaucracy that drains the vitality and wealth of the people.'

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Trump arrives to deliver a speech at Krasinski Square at the Royal Castle

A crowd cheered for Trump during his speech, at times chanting his name

'The West became great not because of paperwork and regulations but because people were allowed to chase their dreams and pursue their destinies.'

Trump also made news in Warsaw for vowing to confront 'new forms of aggression' targeting the West and by calling for Moscow to stop fomenting unrest around the world.

That statement came on the eve of his first meeting with Russian President Vladimir Putin.

Buoyed by an electrified crowd in Poland chanting his name, Trump sought to show he wasn't overlooking Russian actions that have elicited global consternation, especially from nearby nations in eastern and central Europe. He warned that Western interests were being tested by 'propaganda, financial crimes and cyber warfare,' forcing NATO to adapt.

'We urge Russia to cease its destabilizing activities in Ukraine and elsewhere, and its support for hostile regimes including Syria and Iran, and to join the community of responsible nations in our fight against common enemies and in defense of civilization itself,' Trump said in a speech in Warsaw's Krasinski Square.

It was a critique that the president did not appear to extend to Russia's actions last year during the presidential campaign. In a news conference before his speech, Trump questioned the veracity of American intelligence about foreign meddling in the U.S. election, arguing that Russia wasn't the only country that may have interfered.

'Nobody really knows for sure,' Trump said.

Trump spoke from Krasinski Square, the site of a monument commemorating the 1944 Warsaw Uprising against the Nazis

Trump gestures while answering a question from DailyMail.com during a joint press conference with President Andrzej Duda in Warsaw

Opening his second overseas trip as president, Trump also warned North Korea that he's considering 'some pretty severe things' in response to the isolated nation's unprecedented launch of a missile capable of reaching the U.S. Though he declined to offer specifics on the U.S. response, Trump called on all nations to confront the North's 'very, very bad behavior.'

He also stated unequivocally that the U.S. stands 'firmly behind Article 5,' the NATO provision requiring the U.S. to defend other member nations if they come under attack. On his inaugural trip to Europe in May, Trump declined to affirm that commitment, to the dismay of U.S. allies who said it cast doubt on his allegiance to the alliance.

As U.S. investigations into Russia's meddling forge ahead, Trump is under intense scrutiny for how he handles his first face-to-face session with Putin. U.S. intelligence officials say the unpredictable Russia leader ordered interference into the 2016 election that brought Trump to the White House.

Trump and Putin plan to sit down on Friday in Hamburg, Germany, on the sidelines of an international summit. Asked specifically whether he planned to discuss election meddling with Putin, Trump demurred.

Loath to cast a shadow on his election victory, Trump has avoided firmly blaming Moscow for campaign hacking in the past, and on Thursday, he was similarly elusive. He argued variably that it could have been Russia, probably was Russia and indeed was Russia, while insisting it could have been other countries, too, and adding: 'I won't be specific.'

The president sought to redirect scrutiny toward his predecessor, Barack Obama, accusing him of allowing Moscow to meddle on his watch. Though the Obama administration warned Russia publicly and privately before Election Day to stop interfering, questions have since been raised about whether he acted aggressively enough to stop the threat.

'They say he choked. Well, I don't think he choked,' Trump said. 'I think he thought Hillary Clinton was going to win the election, and he said, 'Let's not do anything about it.''

Using information collected by the FBI, CIA and National Security Agency, the U.S. national intelligence director last year concluded that Moscow was behind the hack of Democratic Party email systems and attempted to influence the 2016 election to benefit Trump. The Obama administration said the effort was directed from the 'highest levels' of Russia's government - a reference to Putin.

'Mistakes have been made' by U.S. intelligence, said Trump, issuing a reminder that America's spy agencies had once been confident that Iraq had weapons of mass destruction, creating 'one big mess' in the form of the Iraq War. Though Trump has made similar statements before, it was an extraordinary public expression of doubt about U.S. intelligence capabilities by a president while standing on foreign soil.

U.S. First Lady Melania Trump, center right, looks at children during a visit at the Copernicus Science Center, an interactive science museum geared heavily to young people, together with Poland's First Lady Agata Kornhauser-Dudain, center left, in Warsaw

In his first public comments since North Korea tested an intercontinental ballistic missile this week, Trump declined to offer specifics about what a U.S. response might entail, though he called it a 'threat' and said the U.S. would 'confront it very strongly.' Trump said it wasn't certain he'd follow through on the severe steps he was weighing, adding that he does 'not draw red lines.'

'It's a shame that they're behaving this way,' Trump said of North Korea's leaders. 'But they are behaving in a very, very dangerous manner, and something will have to be done about it.'

The U.S. has been considering a range of possible sanctions, economic measures and other steps to confront Pyongyang. The test of an ICBM marked a major technological advancement for North Korea that U.S. officials have described as intensifying the threat against the U.S. by bringing the North closer to being able to mount a nuclear warhead atop a missile that could hit American soil.

Trump used part of a joint news conference with Polish President Andrzej Duda to attack several U.S. news organizations for their coverage of his presidency. That elicited some sympathy from Duda, who suggested that he, too, was covered unfairly.

'We don't want fake news,' Trump said.

Trump and Duda posed for photographers as they shake hands during their meeting at the Royal Castle

Duda said he hoped Poland would soon sign a long-term contract for U.S. liquefied gas deliveries that will help it cut dependence on Russian oil and gas, which Moscow has previously used as a tool to exert political pressure. Poland received its first U.S. delivery last month, a one-time deal that it hopes to make permanent.

Before his address to the Polish people, the president joined first lady Melania Trump for a wreath-laying ceremony at a monument commemorating the 1944 Warsaw Uprising against Nazi occupation. Crowds waving U.S. and Polish flags gathered near TV screens erected in the square to broadcast the visiting American's speech.

Trump started his day at the Royal Castle, welcomed by Duda with a vigorous handshake in front of a white marble bust of Stanislaw August Poniatowski, the last king of Poland. Joking later with leaders at a summit of eastern and central European nations, Trump boasted of a thriving U.S. economy but lamented his exclusion from recent stock market gains.

'Personally, I've picked up nothing,' he said.