The conflict started in February when President Vladimir Putin ordered his troops to invade.
Ukrainian troops have been battling ever since to repel the Russian forces.
The country has received plenty of military aid from across the western world following the invasion, including weapons sent by Britain.
Among the support sent by the British government includes missiles, UAVs, helmets and more.
Here are the weapons that have been sent to Ukraine by Britain so far:
Stormer High Velocity Missile launchers
Britain has sent a number of Stormer High Velocity Missile (HVM) launchers from Royal Artillery units based at Baker Barracks on Thorney Island to Ukraine.
The versatile weapons systems are able to speed into battle at 50mph and can fire off 17 Starstreak missiles to blitz low-flying jets and helicopters.
The state-of-the-art Starstreak air defence system was part of a package sent by Britain to Ukraine earlier this month.
It was part of a £100m package of support announced by the government at the start of April.
Starstreak is an anti-air weapon, and fire supersonic missiles.
NLAW (Next generation Light Anti-tank Weapon) weapons have been sent to the Ukraine by Britain since the start of the war.
The NLAWs have been particularly effective in helping Ukrainian troops to wreck Russian tanks during the invasion.
New York Times reported in early March that Britain had sent more than 4,200 NLAWs to Ukraine, at that time.
An extra 800 NLAWs were included in the £100m support package announced earlier in April.
As part of the £100m package of support announced by the British government this month, extra Javelin missiles were being gifted to the Ukrainian troops.
Javelin missiles were used by British troops during the Falklands war, 40 years ago.
Extra loitering munitions – a type of unmanned aerial vehicle – were also being sent by the British government to the Ukrainian military as part of the support package announced earlier in April.
What else has the UK sent to Ukraine?
Britain has also sent body armour, helmets, boots, ear defenders, night vision goggles and more.