Sorry, I guess there is a pipeline through Belarus, but I guess it can't scale up much:

Actually, there is the "Yamal-Europe" pipeline through Belarus and Poland, but the plans for doubling its capacity have been postponed, probably indefinitely, due to the construction of The North European gas pipeline. This pipeline is planned to connect Russia and Germany under the Baltic Sea, bypassing both Belarus and Poland.
What a tangled web of pipelines we weave...