<>block is the verb. bid is the direct object of the verb. This reads like a headline because the article on bid is omitted. to block (a) bid = to place a barrier on an offer, perhaps by vetoing it.
Without more context, it's hard to say much more than that. We don't know what specific action Russia is taking which may be considered a blocking action, n
Kosovo has declared its independence from Serbia, U.S. and European support for itsindependence, but Russia has remained opposed to Kosovo's indenpendence.