Kim Jong Un's visit to the clandestine site came as state-run media revealed images of the country's sixth missile launch this month.
"I would expect future port calls in Cuba and Venezuela, but more importantly, I would anticipate announcements on Russia-China military exercises, bilateral agreements and enhanced cooperation," a U.S. intelligence official told Newsweek.
"In the U.S. the question is 'Is Germany a reliable ally?' The question over in Europe is 'Is America going to be a reliable ally?'" the German Marshall Fund's Thomas Kleine-Brockhoff told Newsweek.
The Chinese Defense Ministry said joint drills "further enriched the connotation of the comprehensive strategic partnership of coordination between China and Russia in the new era."
Domestic violent extremists "adhering to a range of ideologies will likely continue to plot and encourage physical attacks against electrical infrastructure," according to a DHS report obtained by Newsweek.
Russia's ambassador to Caracas said Venezuela would "absolutely" support Moscow if tensions with Washington worsened.
"Once the shots are fired, there is no putting the genie back in the bottle," former National Security Council Eastern European Affairs director Alexander Vindman told Newsweek.
"The interesting thing is that the wide variety of issues actually is closely intertwined," a Japanese official said after a meeting between Biden and Kishida.
But Airwars' Emily Tripp also said, compared to prior years, activists "haven't had that level of communication" and "haven't seen that level of interest" from the Pentagon to look into claims.
"Russia believes that weakness narrative, and not just about Biden, not even primarily about Biden, about the West, about the United States and Europe," Jeremy Shapiro of the European Council on Foreign Relations told Newsweek.
Crisis Group's Brian Finucane told Newsweek he "would give the Biden administration a grade of 'incomplete' on winding down the U.S war on terror."
A State Department spokesperson told Newsweek that "the coming days" will prove if diplomacy can succeed, while Russia's envoy warned his country was on the "edge of the precipice."
"The U.S. Secret Service takes all threats to our protectees seriously," spokesperson Justine Whelan told Newsweek.
"It wouldn't be significant because of any of the results," former OFAC official Peter Kucik told Newsweek. "It would be significant because of the fact that it's fairly unprecedented to sanction a leader of the stature of Putin."
Chinese ambassador to Syria, Feng Biao, said the deal would "strengthen Chinese participation in the economic reconstruction" of the war-torn country.
"End that heinous jail," Cuban Foreign Minister Bruno Rodríguez Parrilla wrote in a social media appeal.
The test was "carried out with the purpose of finally confirming the overall technical characteristics of the developed hypersonic weapon system."
Kazakhstan's top diplomat said his country "is ready to have close communication with China to strengthen security cooperation and jointly combat terrorism, separatism and extremism."
Russia's U.S. ambassador said Kazakhstan's turmoil is rooted in destabilizing U.S. military intervention across Western and Central Asia.
"Before foreign intervention, the Kazakhstan government and the protesters must end the ongoing unrest through dialogue," Taliban member Al-Hanafi Wardak told Newsweek.
"A maneuvering warhead improves North Korea's ability to defeat U.S. and allied missile defenses," the Middlebury Institute's Jeffrey Lewis told Newsweek.
Blaming "terrorists" for violent protests, Kazakh President Kassym-Jomart Tokayev "appealed to the heads of CSTO states," which also include Armenia, Belarus, Kyrgyzstan, Russia and Tajikistan.
"These extremist American organizations are looking to create a cadre of trained and experienced terrorists," Kristofer Goldsmith, CEO of the veteran-owned open-source intelligence firm Sparverius, told Newsweek, "a guerrilla warfare veteran, a potential leader of a guerrilla warfare unit when they get stateside."
"We'll do what we can to protect lives in the fight against COVID and in the face of the threats posed to our people," Israeli Prime Minister Naftali Bennett told Newsweek.
"List of invitees suggest political expediency took precedence over genuine democratic considerations," the Turkish embassy in Washington told Newsweek.
"We are prepared to discuss them. That said, there are some things in those documents that the Russians know will be unacceptable, and they know that," a senior Biden administration official said.
Russian ambassador Anatoly Antonov spoke with Newsweek and warned the U.S. and Western allies against steps "beyond the red lines of our national interests."
"In the case of Ukraine, the PR effect of the use of drones and their impact on poorly organized separatist forces pose a threat to Russia," analyst Anton Mardasov told Newsweek.
"As the world's second-largest economy, China can definitely help Russia out in the event of U.S. sanctions," Far Eastern Federal University's Artyom Lukin said.
"The B-52 has and will continue to serve as a vital component of the nuclear triad," the U.S. Air Force Global Strike Command told Newsweek.