Russia is accused by the Ministry of Defence of shooting low-precision missiles into Ukraine from the 1960s.
Anti-ship missiles are being used by the invading army on land targets, according to UK sources.
The 5.5-ton Kh-22 missiles, according to the report, are highly imprecise and can cause significant collateral damage and casualties.
They were built to carry nuclear warheads at sea, but intelligence suggests they were re-equipped with conventional bombs for land use.
Russia is likely utilizing such weapons because it lacks more precise modern missiles, according to MOD officials.
It did not specify where such munitions were believed to have been deployed, and there was no immediate confirmation from Ukrainian authorities that the heavy missiles had been used.
According to the assessment, Ukrainian air defenses continue to impede Russian tactical aircraft from conducting strikes across much of the nation.
The stalemate over control of eastern Ukraine continues, with no end in sight.
According to the Ukrainian military, Kremlin soldiers made modest advance overnight.
The army’s general staff managed to gain a footing overnight in the village of Bohorodychne, approximately 15 miles northwest of the strategic city of Sloviansk, and was ready to attack it, according to its regular operations briefing.
The potential of missile and airstrikes on Ukraine from Belarusian territory remains, according to the bulletin, which also noted that Minsk has prolonged military drills along the Ukrainian-Belarusian border until June 18.
Kyiv has continued to request more armaments from the West, as its army has become increasingly outmanned and outgunned as Russia has concentrated all of its efforts on the Donbas.
Following the disastrous failure to take Kyiv, Vladimir Putin redirected his entire war machine to the eastern region.
Separatists backed by Moscow have held parts of the region since 2014, but in recent months have increased their foothold from 7% to around 20% of Ukraine’s territory.
The daily loss of 100 to 200 Ukrainian soldiers, according to Mykhailo Podolyak, an adviser to Ukraine’s president, is the result of a ‘complete lack of parity’ between Ukraine and Russia, he told the BBC this week.
Only more advanced Western weaponry, he claims, will be able to halt Russia’s offensive and force Moscow to negotiate.