The M1 Abrams are the "most capable tanks in the world," President Joe Biden said.
The Ukrainian president said Russia was looking to "exhaust" Kyiv's forces.
Russian state media lauded the T-14 Armata shortly after the U.S. announced that Kyiv would receive 31 Abrams tanks.
Russian T-90 tanks are "significantly lighter and cheaper" than the U.S vehicles, a clip on the Russia 1 channel said.
The tank was called "revolutionary" shortly after it was unveiled in 2015 but has been dogged with production delays and manufacturing issues since then.
The British Defense Ministry previously called any plans for Moscow to send the T-14 Armata tanks to Ukraine a "high-risk" strategy.
One expert told Newsweek that the report is "plausible" given that the unit took heavy losses at the start of the war.
A fire reportedly caused ammunition to detonate, destroying one tank and damaging two others nearby.
Russia's 1st Guards Tank Army was "probably" among the forces sent to Belarus, the U.K. Defense Ministry said.
The U.K Ministry of Defence said this week that "Russian ground forces are unlikely to make operationally significant advances within the next several months."
In October it was reported that Russia was losing an estimated 10 tanks a day in its ongoing conflict with Ukraine.
Vladimir Putin has admitted logistical and supply issues within Russia's newly mobilized troops.
"It's good that we have stupid neighbors who left the equipment in such condition," a Ukrainian soldier said.
"We remind all occupiers that unauthorized walks through Ukrainian forests will always end badly for them," the Armed Forces of Ukraine said.
Using "old Soviet tanks" and "new Russian conscripts" is "doomed for success," Anton Gerashchenko, adviser to Ukraine's internal affairs minister, tweeted.
This video comes as Ukraine's counteroffensive has resulted in Russian held regions be recaptured.
The Pentagon has estimated over 80,000 Russian troops have died or been injured in Ukraine since the beginning of the war in February.
The Ukrainian armed forces said that most of the Russian losses were towards Donetsk and Kryvyi Rih.
The Ukrainian general staff claimed on Facebook that almost 49,000 Russian military personnel have died in the invasion since February 24.
The all-weather Ka-52 "Alligator" attack helicopter can destroy both armored and unarmored targets, low-speed aerial targets and military personnel.
The destruction of an anti-tank complex on Thursday accompanied successful Ukrainian attacks on multiple Russian ammunition warehouses.
Earlier this week a Pentagon official praised the Ukrainian army for its "12 out of 10" performance in combating Russia's aggression in the country.
The success comes as Ukraine prepares for a major counteroffensive in the south. A think tank says it could stave off Russian annexation plans.
Russian officials have so far publicly denied that Moscow is having difficulties sustaining Putin's war effort in Ukraine.
Ukraine's Defense Intelligence said on July 3 that some of the damaged or destroyed Russian equipment has been "sold or exchanged for alcohol."
Putin's decision to deploy old T-62 tanks on the battlefield highlights "Russia's shortage of modern, combat-ready equipment," British intelligence said.
Tanks have been sent to the frontline after being blessed by a local archbishop.
A video showing the two destroyed Russian armored vehicles has been viewed over 280,000 times on social media.