Putin's spokesman said Moscow wants to hear Trump's opinion after his deputy accused Russia of "efforts to redraw international borders by force."
American forces are currently deployed to the region for a series of exercises with NATO allies.
Moscow said it reserved the right to respond to Montenegro's "hostile course," while Washington praised the country for "choosing its own alliances."
The German weekly Der Spiegel has laid out a devastating case against President Donald J. Trump after his withdrawal from the Paris climate deal.
Russian President Vladimir Putin criticized the media, claiming it has stayed "silent" on U.S. and NATO military expansion.
The Russian president outlined the action he feels would be necessary and said Sweden would be no safer in NATO.
Was there a deal? Trump is certainly doing everything Putin wants done.
After many fallouts between Turkey and its European allies, 18 EU nations and Canada are reportedly vetoing plans to host NATO's next summit in Istanbul.
Russian lawmaker Vyacheslav Alekseyevich Nikonov said nuclear weapons would be necessary in the event of a U.S. or NATO invasion of Crimea or eastern Ukraine.
Erdogan watched as security guards beat, strangled and stomped on demonstrators.
"We remember fascism. We never thought it would happen in America."
Russian Baltic crews are already trained in using the new multirole fighter-bombers.
Russia and Belarus's neighbors are concerned about the huge drill they have planned.
The Latvian ambassador to Canada said he does not feel safe even as NATO forces arrive ahead of Russian war games simulating an attack on the West.
Defense Secretary James Mattis called Russia's missile moves "destabilizing" as Moscow positions for war games with Belarus.
Russian troops should collect proof of being coerced to engage in unlawful combat.
Reports suggested Russian ships might be readying for the arrival of a U.S. ship in the region.
A top Army general of U.S. and NATO's European forces said the Western military alliance is taking a wartime posture to Russia's rise to the world stage.
The head of the U.S. command in Europe asked lawmakers to consider deploying more troops and equipment to ward off Russian aggression.
Populism is proof of the clash between a globalized world and national democracies.