The first is a massive attack of armed forces. The second involves economic isolation and a change of political leadership.
The President of Ukraine also noted that the problem of resolving the situation in eastern Ukraine can be solved only through diplomatic means.
According to Sigmar Gabriel, Washington began to oppose the project when it became a gas exporter.
Russian supreme authorities still believe that the mutual benefit of preserving the alliance with Belarus is unquestionable.
The existing contract expires at the end of this year.