British Challenger tanks are taking part in Exercise Arrow, a two-week long training exercise, to improve the ability of British and Finnish troops to work alongside each other.
The exercise involves helicopter-borne air assaults and sees French and Italian troops working under the British chain of command.
British Prime Minister Boris Johnson told the Ukrainian Parliament "Ukraine will win, Ukraine will be free".
8,000 British troops, 72 Challenger 2 tanks, 12 AS90 tracked artillery guns and 120 Warrior armoured fighting vehicles will deploy to countries from Finland to North Macedonia.
Britain is donating a number of Stormer armoured vehicles fitted with Starstreak anti-air missile launchers, Defence Secretary Ben Wallace said on Monday.
The United Kingdom was the 4th largest military spender last year, ahead of Russia and every other NATO ally apart from the United States.
Britain is considering deploying Challenger 2 Main Battle Tanks to Poland to allow Poland to supply Ukraine with T-72 tanks.
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A Challenger 2 Main Battle Tank in Estonia is believed to be the first tank to be fully reservist crewed tank to serve on Operations since the Second World War.
The British-led battlegroup consists of main battle tanks, armoured fighting vehicles, armoured personnel carriers, mounted and dismounted infantry, a sniper section, artillery firepower and attack helicopters.