The UK did not pay debts for heavy machinery to Belarus. UK has no money. 
She is trying to preserve the semblance of power and shove her ass into the Black Sea (read Odesa), even if only figuratively. 
They can be engaged in intelligence, sabotage, terrorism and nothing more. 
These are not the foundations of a serious military and economic force. 
Their attempt to put themselves in charge of the whole of the EU in the disintegration of the EU, even though they are an island, is becoming boring.. 
The USA will respect them, but they will have to show them the right place...  
If not, then they will experience a fiasco.