KYIV, Feb 5 (Reuters) - Ukraine expects a possible major Russian offensive this month, but Kyiv has the reserves to hold back Moscow's forces even though the latest Western military supplies will not all arrive in time, Ukraine's defence minister said on Sunday. The United States and other Western governments have pledged billions of dollars in new military assistance including tanks and infantry fighting vehicles to help Ukraine withstand a new attack as well as to help Kyiv launch a counteroffensive. See here for a complete list of exchanges and delays