London judges, no strangers to disputes involving vast sums of money and international corruption, will have to turn diplomat in deciding whether Russia bullied Ukraine over a $3 billion bond.

They’ve been asked to consider the annexation of Crimea as part of a document submitted by Ukraine’s lawyers last month in a lawsuit over a bond Kiev defaulted on in December. The 42-page defense also touches on political pressure and Russia’s support of a rebel conflict in Ukraine’s east that crippled the economy and made it impossible to repay the debt.