<p>British Prime Minister Boris Johnson warned Russian President Vladimir Putin in a call on Monday that any destabilising action against Ukraine would be a strategic mistake with significant consequences, Downing Street said.</p>.<p>"The Prime Minister emphasised the UK's commitment to Ukraine's territorial integrity and sovereignty, and warned that any destabilising action would be a strategic mistake that would have significant consequences," a spokesman said.</p>.<p>"He expressed the United Kingdom's deep concern over the build-up of Russian forces on Ukraine's border, and reiterated the importance of working through diplomatic channels to deescalate tensions and identify durable solutions." </p>.<p><strong>Watch the latest DH videos here:</strong></p>
<p>British Prime Minister Boris Johnson warned Russian President Vladimir Putin in a call on Monday that any destabilising action against Ukraine would be a strategic mistake with significant consequences, Downing Street said.</p>.<p>"The Prime Minister emphasised the UK's commitment to Ukraine's territorial integrity and sovereignty, and warned that any destabilising action would be a strategic mistake that would have significant consequences," a spokesman said.</p>.<p>"He expressed the United Kingdom's deep concern over the build-up of Russian forces on Ukraine's border, and reiterated the importance of working through diplomatic channels to deescalate tensions and identify durable solutions." </p>.<p><strong>Watch the latest DH videos here:</strong></p>