Defense Secretary James Mattis called Russia's missile moves "destabilizing" as Moscow positions for war games with Belarus.
U.S. officials say Iran recently tested its supercaptivating Hoot torpedo, capable of traveling 250 miles per hour by evaporating the water around it.
The U.S. and Russia will once again work together to avoid mid-air collisions in Syria after a falling out between the nations last month.
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 Kremlin swiftly denied the report and its source, a former Russian military spokesman, blasted foreign media for misinterpreting his words.
Top Russian political and military officials said the U.S.'s missile defense shield in Europe may encourage Washington to launch a nuclear attack on Moscow.
Its manufacturer aims to make it capable of taking down a target at an altitude of 100km.
Russia and China have denied media reports indicating that the nations deployed additional military forces to North Korea's borders as tensions mount with the U.S.
Russia's lack of jamming capabilities means they are developing a shrapnel weapon likely to be fired from vehicles.
Moscow has a message for the world: hands off the North Pole.
The Kinetic Energy Projectile launches a tungsten-based missile at Mach 3 that delivers a "devastating" load of hot metal fragments.
Putin claims to have evidence that the rebels are planning chemical attacks that will be pinned on the Syrian regime.
A Russian warship, armed with some of Moscow's most powerful missiles, was deployed to the eastern Mediterranean where two U.S. destroyers had launched strikes against Syria.
Russia bolstered its support for Syrian President Bashar al-Assad in the face of U.S. military action.
Russian politicians have criticized the U.S. airstrike on the Syrian military.
Five Latin American nations have expressed interest in buying Russian fighter jets used in Syria as Moscow makes military deals at an international arms show in Brazil.
U.S. Strategic Command head Gen. John Hyten said the U.S. had "no defense" for Russia's SSC-8 nuclear-capable cruise missiles in Europe.
Russia has delivered a batch of shoulder-fired Igla-S air defense missile systems to Brazil and has planned on sending Panstir-1 air defense and artillery systems.
Russia fired missiles only miles away from NATO forces in the volatile Black Sea region, where the U.S. has accused Moscow of threatening its interests.
Serbia's Defense Minister Zoran Djordjevic said Russia would provide his country with free jets, tanks and armored vehicles as Moscow seeks to increase its Balkans influence.