Marin is younger than New Zealand's Jacinda Ardern, 39, and Ukraine's Oleksiy Honcharuk, 35.
The Nordic country has been under Swedish and Russian rule before its declaration of independence.
The five men were arrested on November 28 in a forest near Vyborg, by Russia's border with Finland.
Climate change is causing Arctic sea ice to recede, opening up lucrative economic opportunities but pitting great powers against each other in a race for influence.
"Well, you got rid of Pelosi and you got rid of shifty Schiff. Finland is a happy country," Trump said, adding that Finnish President Sauli Niinistö is "a happy leader, too."
"He hit a girl in the neck with a sword and stabbed her in the stomach," a witness told the Keskisuomalainen newspaper.
Sauli Niinistö also warned that the rules-based liberal world order is "crumbling before our eyes," and required global cooperation to save it.
"What Mr. Trump ought to fear the most is that the Russians in particular, eventually will use their version of the events against him," retired four-star General Barry McCaffrey warned.
"This is as much about mismanagement over time," Zinke said, backing Trump.
Finns are mocking President Donald Trump with the hashtag #RakeAmericaGreatAgain after the U.S. leader suggested that Finland was able to prevent wildfires by "raking" the "floors of the forest."
President Donald Trump's bizarre advice on "raking and cleaning" forest floors to prevent wildfires may not have originated with Finnish President Sauli Niinisto as he claimed.
"I was with the president of Finland," Trump said. "He called it a forest nation ... And they don't have any problem."
"Russia is known to possess such capabilities," said Finnish Prime Minister Juha Sipila.
Sergey Lavrov says U.S. criticism won't prevent the two leaders from reconvening.
Jehovah's Witnesses in Russia face a tough choice: be persecuted at home or become refugees abroad.
"This trend clearly indicates that NATO countries are trying in every possible way to prevent Russia from emerging as a geopolitical competitor."
It had been one of those days.
The Russian president insisted he and Trump had made "useful agreements," but the Department of State said all Washington received were proposals it had not yet accepted.
Trump boasted that Putin made him an "incredible offer," but the Russian president clarified that he expects something in return.
Russian senators have thanked Trump, portraying him as a lone crusader who will "spit in the face" of Washington's past policies.
"When are you going to ask him for an autograph or a selfie?" the ex-governor said of Trump's flattery of the Russian leader.
Moscow's top diplomat traveled with the Russian delegation to Finland, and Trump's performance has delighted the Kremlin greatly.
Putin's Aurus Senat Kortezh was unveiled in May and has been seen alongside Trump's Beast limo in Helsinki.
The two leaders began the day with a tête-à-tête—and are now in a bigger meeting with officials.
The Finnish capital is no stranger to high-stakes Moscow-Washington summits.
The EU's top court found that the Jehovah's Witnesses' door-to-door preaching is a form of data collection and requires consent.