Writing in The Times on Tuesday, Johnson said Britain is considering deploying Royal Air Force Typhoon fighters and Royal Navy warships to protect southeastern Europe.
Johnson also said Defense Secretary Ben Wallace and Foreign Secretary Liz Truss will both travel to Moscow soon.
Russia has amassed some 100,000 troops near the Ukraine border.
It denies it is planning an invasion.
"British sanctions and other measures will be ready for any renewed Russian attack," Johnson wrote.
"The government will ask parliament for new powers to sanction a wider range of Russian individuals and entities, including any company linked to the Russian state or operating in a sector of strategic importance to the Kremlin." The UK is also preparing to reinforce the British-led Nato battlegroup in Estonia, Johnson said.
"I welcome Germany's statement that Nord Stream 2 would be reconsidered in the event of an incursion," he added.
but did not directly confirm the Nord Stream 2 plans.
Europe's most divisive energy project, Nord Stream 2 is designed to double the amount of gas flowing from Russia straight to Germany, bypassing Ukraine.
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