Revealed: The forgotten treaty which could drag the US and UK into war with Russia if Putin's troops intervene in Ukraine
The Memorandum of Budapest (1994) sees signatories promise to protect Ukraine's borders.
Putin currently has 150,000 troops on Ukraine's borders and it is reported some have crossed into the country. President Obama says he is 'deeply concerned' by the news. The US and Britain have both made 'crisis calls' to President Putin to warn him to respect territorial boundaries. Here's why. A treaty signed in 1994 by the US and Britain could pull both countries into a war to protect Ukraine if President Putin's troops cross into the country.